I like the function of the emonVs. The function is well thought out, particularly because it can be used with many devices.
I mounted just outside the panel (load center) see similar thread 21 Jul 25 Yes, it will be a challenge to inspect and maintain.
Connecting the AC to the emonVs is awkward for North America. For example, please note " … form the wires to minimize the stress on the connector" I would propose a cover redesign. The top cover could be two parts, basically splitting it to be able to expose the connector on one part and the main part much the same.
The main part would have 3rd and 4th screws.
The connector cover is more of a challenge. I’m thinking the 12.5mm hole extending to the edge will a filler coming up? Two parts, one permanently attached to the base with the hole in this part? or the main part? The other part is just a hatch to access the connector?
Definitely center the hole on the connector, putting two mounting tangs in the corners.
I have no idea how to incorporate a strain relief, but this should be done.
Or, just forget the box completely and mount into a 3-gang box.