Tool Hook / Hanger / organizer.

Hook for hanging tools and wire loops. I also printed some in white to hold a razor in the shower.

Uses double-sided tape to hold it in place.
While you can use any double-sided tape, the absolute best is 3M VHB Clear tape. You can find it here:
http://amzn.to/2mci0GO (affiliate link)

I've used the gray version, and it doesn't work as well. I've also tried various other double-sided carpet tapes, and they all eventually fail.

Final note: make sure you clean the plastic with rubbing alcohol before applying the tape. If there is any oil on the plastic it will cause the tape adhesive to fail eventually.