Most under-desk cable trays are sold on the assumption that you own your desk and are happy to drill into it. If you rent, or the desk was expensive, or it is laminate that will chip the moment a screw bites, that assumption rules out a lot of otherwise good hardware.
It does not have to. There are three mounting methods that hold a full tray of cables without a single hole.
Clamp-on
A clamp mount grips the desktop between a fixed jaw and a screw-down pad, the same way a desk lamp or a monitor arm does. It is the strongest of the no-drill options and the easiest to remove.
The measurement that decides whether it works is your desk thickness at the edge where it will mount. Measure it before ordering. Most clamps cover a range — commonly around 1 to 5cm — and a desk outside that range simply will not hold. Also check there is nothing in the way underneath: a cross-brace or an apron running along the edge will block the jaw.
Adhesive
Modern adhesive mounting is better than its reputation, but it is fussy about surfaces. It holds well on smooth laminate, sealed wood and metal. It holds poorly on raw or oiled wood, on anything textured, and on dusty surfaces.
Two things decide whether an adhesive mount lasts:
- Clean the surface properly first. Isopropyl alcohol, not a household spray — most sprays leave a residue that is exactly what the adhesive then bonds to.
- Let it cure before loading it. Most adhesives reach a fraction of their final strength on contact and full strength after 24 to 72 hours. Mount it, then leave it alone for a day before filling it.
Done that way, an adhesive tray will hold a power strip and a tangle of cables indefinitely. Done in a hurry on a dusty desk, it will be on the floor by the weekend.
Tension and gravity
Some trays sit on a frame that wedges between the desk legs, or hooks over an existing cross-member. These need no surface preparation at all, but they depend on your desk having the right geometry. Worth checking before ordering rather than after.
What actually goes in the tray
A tray only tidies a desk if the bulky things go inside it. In practice that means the power strip first — it is the single largest object and the one everything else plugs into — then the power bricks, then the slack.
Leave a small service loop where cables leave the tray so you can pull a device forward without unthreading the whole thing. And run the cables you unplug often, like a laptop charger, along the top rather than buried at the bottom.
A note on sit-stand desks
If your desk moves, cable management stops being cosmetic. Every cable that reaches the floor needs enough slack for the full travel of the desk at its highest position, and nothing should be able to snag as it descends. The usual approach is to get everything possible into a tray that travels with the desk, so only one bundle runs to the wall.