Omg I sound like a freaking stalker but I learned this in a movie. (This paragraph will be about the movie) this was this family moving to a neighborhood and their neighbors seemed friendly, especially the man who lived next door. The family's children were making friends with the neighborhood kids and all. K so one day the mom of the family thought someone entered their house. She thinks it was the man and she went into his house (the guy gave her keys) and saw video tapes. She watches them and realizes the tapes were from her house. Before she moved the guy implanted cameras in every room of the house.
When you find their address make sure to look up the house on google then go to their houses in disguise and do what you have to do. I wuldnt recommend it, they can report the issue.