Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4601284.

This thing is an adapter/mount to secure an Ubiquiti EdgeRouter X and Unifi Switch 8 150W in a 19-inch 1U rack slot. The mount can be installed to either side of the switch. The EdgeRouter X has to have the rubber pads removed to fit into the slot where it is secured with two M3x6mm screws and washers.

Source: https://cad.onshape.com/documents/e645343fbebec8287baf9f70/w/ed073d65ee097c8532df73ec/e/9226584cce18fc1f416dd2f2