Last year, I brought down a set of "faux security cameras" and placed them on the walls of the Balcony and Terrace at my condo in Punta Cana. They must have looked very realistic, because the neighbor across the lawn got ballistic when he saw them flashing and actually broke one of them....come to find-out he was dealing drugs or something illegal and was evicted shortly after that...lol
I'd be very leery about "faux security" anything. First of all, I think it screams out to crooks "hey, those people must have some good stuff in there for them to spend money on security", and secondly, if you don't have the real thing you could be in trouble when they do break in.
I'm more inclined to try to meld into the surroundings and not draw any attention to myself or my house. So far so good.
I hope I didn't just jinx myself.
One thing we did do was install a motion detector near the front door that has a very annoying shriek if anyone walks by it. Our house is wide open all day, front & back doors, and we're usually out back. We turn it on when we know we'll be out on the terrazzo for a long time, just to warn us if someone does walk into the house.