I'm very sorry for the delay response. I see many suggesting something similar to this, but i don't quite understand how it all fits. I want something like this but in zwave instead of WiFi since i have this same thing, but normal all around my house.

I just can't understand how 3 single gang will fit into a 3 gang plate. Don't they have similar "internals", hence they won't fit on a single space? Am I missing something here?