A holder for those generic remotes (fits up to 42mm wide and 8mm depth)

Holes are for 10x2 magnets that can be glued in (smaller magnets might work too)

The tall version has 2 additional magnet slots and is nicer to use if you intend to press buttons while the remote is in the holder.

Printing:

The holes should print okay without support

Depending on your printer you might want to add a small brim