Due to the small contact area, sticking directly to the wall may not be very secure.This part can be fixed without drilling holes in the wall.Use m3 brass nut on the side of the reserved hole, and stick the other side to the wall with a snap fastener.Then screw the two together using the original wall fasteners.
Use M3x8 fhcs screw
The author remixed this model.
The original model needed to be fixed by drilling holes in the wall, so you can avoid drilling holes using it.