Do under-desk cable trays require drilling?

It depends on the mount. Several picks here use a clamp or screw mount, and many models offer both, while adhesive/no-screw trays attach directly to the desk underside with tape. Verified-purchase reviewers across the listings we read generally report clamp mounts hold heavier loads more reliably, while adhesive mounts are easier for renters but can loosen over time on textured or unfinished surfaces.