Relay Holder / Wall Plate

For an Arduino control project.
I got a bunch of these single relay boards which are optical isolated from China for near nothing. Needed a case that would be serviceable and fit into a 2 X 4 electrical box. The relay board is a press-in fit, yet leaves full access to the electrical connections. The holes on the plate front are just that. I have not figured out how to make them for a counter-sunk screw, (yet). I provided a picture of the relay board for sourcing purposes. There are no part nu