Keyhanger with backboard

I like NilsOla's keyhanger for its small size and simplicity, however I needed a little bit different hanger, so I made the following changes:
- I filled the screw hole, because I want to mount this to the wall with double sided tape.
- I added a backboard, because I want to protect the wall from sprayed surface disinfectant. The backboard has a little drip tray at the bottom to collect the fluid before it flows to the wall.