Right you are, but I'm counting security cameras as Power requirement 2, so you can only hex two of them with one action. Still, if you're walking slowly, you can hex all the security cameras no problem.
Works for me, I figured 1 or 2. So two at a time and any one things in sight? What about the bartender's cash register? Or the lights >:) I'm throwing a temper-tantrum here :P