Value Tree Clamp-On Bedside Shelf, 13 × 9.5 in, Black

Why this one

It grips the frame with a screw clamp rather than trusting tape, so nothing sticks to anything and the whole thing comes off with you when you move. Two honest caveats: no load figure is published, and the listing itself warns that overloading warps the clamp - so treat it as a phone-and-glasses shelf, not a book shelf. The clamp opens to 2.9 in, which covers most metal bed frames but not a chunky wooden one.

What it had to clear

• clamps to a rail or edge rather than sticking to a wall
• rubber-lined clamp so it does not mark the frame
• a surface big enough for a phone and a mug

One of 8 compared in 8 Damage-Free Wall Shelves That Actually Hold in a Rented Bedroom.