I installed a Vue 2 Monitor linked to 15 circuits in an (indoor) external enclosure using a 1 1/4 inch Rigid-Offset-Conduit-Nipple (Home Depot) and a electrical box 10x8x4 that I found on Grainger (Wiegman SC081004). The box for the Vue was larger than I needed, but finding one with a 1 1/4″ knockout seemed to require a box with at least one side of 10″ or more. As you can see in the photo, I had to work around an old irrigation and security system installation – all the wiring for the Emporia is enclosed (the vertical wires on side of the box is from the security system). The wifi antenna is mounted on the external box.