I created this wall mount for my desktop speakers. It has a 3" x 3" platform for the speaker to sit upon. It is mounted to the wall using two #10 countersunk drywall screws. It has a small slot in the back for a 1/8" diameter speaker wire.
If the model is super tiny when you open it up in the slicer, just change the scale from mm to cm (multiply by 10).
I had some trouble with the bottom pointed edges lifting off the print bed. Adding a raft fixed it.