Customizable Game Controller Wall Mount

I wanted to wall mount the two 8bitdo SNES-style bluetooth controllers I have for my RetroPi system. I liked the mount from the source thing but since these are wireless, I didn't want the extra space used for cord control. These should be customizable for similar controllers/rectangular shapes. The first print I made was 5mm too small but worked well for wired N64 controller I also have for RetroPi.