Oooh, this is a great question.
I live in a VERY small town. Keeping it hidden from Public space won't be hard. Trellis, camo plants, easy.
My neighbors are very chill, all their kids are grown, and most of them already know I'll be growing outside. Hell, they're ready to come over for a smoke in the sunroom.
As for my "security device," I've got a fence and two dogs.
A motion sensor light doesn't make sense, of course. Im considering a camera. We'll see how much money I'm willing to spend the time comes.