This is a two part model designed to mount to a standard 3 gang junction box, though it could also just be attached directly to a wall or other surface.  The base has three standoffs that match up to the latching base for the network dock.  You can secure the base by melting the filament standoffs down. 

My thought is you can either route the Ethernet cable out the side of the box, or if you're using a j-box, just flip the dock around and keep all the cables internal.   

The top clamshells the Stream Deck module to the mount and allows for room for the USB-C cable to route internally.  I created four holes for a 3mm screw mount to be put in. 

I added a bevel to the front after I printed the prototype and made the mounting screw holes slightly larger as well, so this is a difference in the models/pictures.