I wanted to share this with you, it looks cool! if you want the STL file just drop me a comment..
Step 1: How It's Done..
I designed the holder after taking the measurements of my router so it fits perfectly..
Then used M3 tape (double sided) to stick it on the wall..
You have to move down the antenna so you can insert the circular part of the router into the holder, then move it up back, the router will never fall down!