My parents once had retrofit alarm systems on the window doors - it annoyed everyone so much that they were never used again after 2 months. We have RC2-N on the ground floor - so more mushroom cams and lockable olives. Furthermore, we have numerous curious neighbors, a house that looks smaller from the outside than it actually is, as well as a Peugeot in front of the door - hopefully the latter should act as a deterrent :D