The mount was not big enough for my T-Mobile gateway, so I embiggened it for the "FAST 5688W" model. Printed with 40% infill and fuzzy-walls in PETG. I suggest mounting one side into a stud and the other with a wall anchor. You could probably use less infill, if you modified the area right around the mounting holes to be 40% infill, but the filament savings may not be worth the effort.
The author remixed this model.
The mount was not big enough for my T-Mobile gateway, so I embiggened it for the "FAST 5688W" model.