Monitor Arm Accessories Explained: Laptop Trays, Non-VESA Adapters and VESA Extension Plates

Accessories can make a monitor arm solve more desk problems, but they change the load, dimensions and compatibility of the setup. Choose them only after confirming the main arm is suitable for the screen, desk and mounting method.

VESA laptop trays

A laptop tray attaches to an arm’s VESA plate and holds a laptop with a shelf and retaining lip. It is useful when the laptop must act as a second display at eye level. Check the tray’s weight limit, supported depth and ventilation clearance. Keep all intake and exhaust vents clear, and do not assume a monitor arm that supports a light display also supports a laptop tray plus a heavy laptop.

Non-VESA monitor adapters

Some monitors have no standard VESA holes. An adapter may clamp around the display or attach through the stand interface, but compatibility is model-specific. Check the monitor dimensions, adapter capacity, screen curvature and clearance for buttons or ports. The adapter adds weight and leverage, so the combined load must still sit inside the arm’s safe range. Read your no-VESA mounting options before choosing one.

VESA extension plates

An extension plate adapts a smaller VESA plate to a larger VESA pattern. It helps only when the arm maker permits it and the extension does not exceed the arm’s load or geometry limits. It does not fix recessed mounting holes, incorrect screw length, an unsuitable desk or a monitor that is too heavy.

Spacers and screws

Recessed VESA holes may require spacers and longer screws so the arm plate sits flat without bottoming the screw in the monitor. Use only suitable screws and spacers supplied with the display or arm, or those confirmed for the model. Our recessed-VESA spacer guide explains the checks.

Accessory safety checklist

1. Confirm VESA pattern and the accessory’s stated dimensions.
2. Add the accessory’s weight to the monitor or laptop load.
3. Check the arm’s capacity and tension range.
4. Verify desk clamp, grommet or top-side mount suitability.
5. Move the setup through its full range before securing cables.

Start with ULTI’s monitor-arm hub, then choose accessories that create a verified system rather than a collection of parts that merely look compatible.

How to use this guide for your own setup

Turn the specification sheet into a real compatibility check

Screen size alone does not tell you whether an arm will work. Find the monitor model on its label or manufacturer page, then write down its weight without its original stand, VESA mounting pattern, the position and depth of the VESA recess, and the dimensions of the rear housing. These details affect both the arm’s load range and the physical clearance when the screen is raised, rotated or pulled forward.

Measure the desk as well as the screen

1. Measure desktop thickness at the exact clamp position.
2. Check beneath and behind that point for drawers, cable trays, rear support bars, modesty panels and wall clearance.
3. Measure the available depth. A gas-spring arm needs room to articulate; a portrait screen can need more height and rear clearance than expected.
4. Plan the cable route with the arm at its furthest and highest position. A cable that is taut at one position can pull on a port as the arm moves.

Before you buy

Ask for the supported load range per arm, clamp and grommet requirements, VESA hardware supplied, and whether an adapter is required for your exact monitor. Do not rely on a marketplace title or an image alone: compare the listing details with the model’s official specifications. If anything is unclear, photograph the rear of the monitor and the desk edge, then use ULTI’s monitor arm finder or the monitor-and-desk fit FAQ to work through the fit before ordering.