One dual mount wins on price, desk space, and cable tidiness; two single arms win on flexibility and stability. The right answer usually comes down to whether your two monitors are identical.
A mismatched pair breaks most dual-mount plans. Once one display is heavier, wider, or rotated vertically, a single base carrying both arms becomes a compromise, and the total load limit starts deciding for you.
How Do You Choose Between One Dual Mount And Two Single Arms?
Pick one dual mount when your monitors are the same size and weight, your desk is small, and you want one clamp instead of two. Pick two single mounts when the monitors differ, when you plan to swap or add a display soon, or when you want each arm to hold position without affecting the other.
A dual mount frees desktop space and generally costs less than two arms of similar build quality. It gives up adjustment room: both arms share one pole, so they often collide when swung toward each other, and the combined weight ceiling applies to the pair, not each side. Where monitors are identical, that matters little. Where they aren’t, it matters a lot.
What Decides The Outcome: Weight Limits, VESA, And Desk Clearance
A monitor must match the mount’s weight and size specs, and VESA pattern is the first thing to verify before buying. Buying by monitor count alone, without reading the per-arm weight limit, is the most common mistake here.
A 34-inch ultrawide plus a 24-inch is already past what most dual bases handle.
BenQ notes dual arms carry more per-arm size and weight restrictions than two single arms — the clearest argument for going separate with non-identical displays. Wall clearance matters too: on a desk against a wall, two separate arms can place monitors farther forward for easier side-by-side positioning, since each base sits where needed.
| Setup | Where It Wins | Where It Falls Short |
|---|---|---|
| One dual mount | One clamp, lower cost, less desktop footprint | Tighter per-arm size and weight limits; tighter side-by-side range |
| One dual mount, heavy pair | Single cable run, symmetrical desktop look | Shared total capacity; load shifts as you reconfigure |
| Two single arms | Independent height, tilt, and rotation per monitor | Two clamps or grommets; usually higher combined cost |
| Two single arms, mismatched pair | Each arm rated only for its own monitor | Two bases to align and keep symmetrical |
| Two single arms, wall-side desk | Easier to push monitors forward and arrange side-by-side | More hardware to install and adjust |
| Desk with one clamp hole only | Dual mount is the only option that works | Flexibility is capped by the shared pole |
| Plan to upgrade one screen later | Separate arms let you swap one display without touching the other | Dual mount may force both monitors to change |
Ergotron’s dual-mount lineup shows how much hardware varies within one brand, with pricing spread across LX and HX models and different pole heights and clamp styles. Check that range against your monitors before committing — or compare tested options in this roundup of 2 monitor mount picks.
Which Setup Holds Position Better Day To Day?
Two single arms generally hold position better because load is split across two bases instead of one. A heavier monitor on a shared pole can drift or force you to tighten the joint until adjusting it takes two hands.
Installation follows the same pattern: two single arms are easier to install and modify later, since each is assembled, clamped, and adjusted on its own. A dual mount requires seating and balancing both monitors while one base carries everything. Either way, use only mounts rated for each monitor’s weight and size, and never exceed stated capacity — Ergotron’s total load ceiling is not a suggestion.
Which Should You Buy?
If your monitors match in size and weight and you want lower price and smaller footprint, one dual mount is smarter. If they differ, or you’ll upgrade one within the year, two single mounts cost more up front but save you from replacing everything later. Before ordering, write down each monitor’s weight, screen size, and VESA pattern, then compare against the mount’s published per-arm and total limits. That step settles the decision faster than any spec debate.
FAQs
Can one dual mount hold two different-sized monitors?
Sometimes, but limits usually apply per arm, so the larger monitor may exceed what the base allows. If your screens differ by more than a couple of inches, separate arms are safer.
Is a dual mount cheaper than two single mounts?
Usually yes. One dual mount replaces two bases, two clamps, and two hardware sets with a single assembly, so total cost is typically lower than two comparable arms. Savings shrink when your monitors need heavy-duty arms a single dual base can’t carry together.
Do I need to check VESA before buying either setup?
Yes, always. VESA compatibility is a required check, and mount instructions say to verify it against manufacturer specs before purchase. A monitor whose VESA pattern doesn’t match won’t mount at all, regardless of which setup you chose.
References & Sources
- BenQ. “Best Dual Monitor Setup With Monitor Arm” Notes that dual arms carry more per-arm size and weight restrictions than two single arms.
- Ergotron (via Lenovo). “Ergotron Monitor Mount For 2 Monitors” Product page supporting dual-mount specifications and total load capacity.
