Fits over a standard (well Australia/NZ) light switch/telephone point wall plate giving you a shelf.

Designed to be the perfect size to hold my modem with cutout for a power cable thereby hiding all the cables behind the modem (and freeing up bench space).

Design is parametric so feel free to tinker and adjust to your needs, has a single screw hole as the first one I printed didn't, and therefore started to twist away from the wall.