I just took an Apple TV mount that someone else designed and modified it to fit the new AT&T Netgear Nighthawk LTE Hotspot Router. I am probably still going to modify this file some more. I haven't received my router yet to test fit this. Feel free to improve on this design.
This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/4WwZ3YP7dHm