This is a Starlink Gen 3 router wall bracket that will allow proper cable bend radius out of the rear of the unit when mounted to the wall.
This can be printed without supports if you have the model oriented properly in the slicer. When I printed the unit in the pictures I have the “back” / “flat” side down which required supports and my print was not exactly the finish I preferred, but it worked for being in the basement. If you prefer finish then I would recommend printing them with the larger side down.
I printed this on my Ender 3 S1 Pro with Voxelab PETG Carbon filament. Filament I used can be found here:
The author marked this model as their own original creation.