You need 2 Screws for mounting. Fits m3 and m4 screws. You should use around m4x40, but m4x30 or m4x50 will work too.
The buttons and Lights are still fully accessible and visable. The FRITZ!Box fits only one way because of the railing on the inside. (The side where the railing goes all the way to the edge will be the top side)
If you want to mount it in a different direction be sure to mirror it before printing. I made this to work on a straight wall, the Router could fall of if its mounted on an angled wall.