Sounds to me like you have a low voltage remote controlled system that uses normally open, single pole, double throw momentary switches. I had to replace some switches for a customer with such a system. Call Tristate electrical supply(Moravia Park Drive in BAltimore,MD)Tell them the type of switch I mentioned above and that you want the cover plates. Mention exactly the number of switches per plate. They come in white,ivory, brown,gray. These line of switches are called "Despard" Switches. I dont believe that you have a smart house in what we call a smart house in todays standards.