Hello! Ezequiel here. customCommands should be inside the config of the Remote Control. You can raise a question in the issue page for further instructions. Cheers :D

Hey! So, there are probably a lot of ways to turn on and off your monitors, but I’m gonna link the one that worked for me. I was using MMM-Remote-Control, but you can take those commands and run them expecting to turn on and off.

https://github.com/Jopyth/MMM-Remote-Control/issues/168#issuecomment-572890815