The two in the avatar- automatic door alarms- after that all bets are off. Oh, Loon is sane compared to me. Game cams work well but you need a way of capturing vehicles plate # if possible which means a low light cam set physical low to avoid most of headlight and such flare at night - IR emitting units wash out the plates due to reflection. Unfortunately being pro-active in this area equates premeditated in the courts. Eliminating the threat is the easy part. Getting rid of the evidence is the difficult part.
Raising a few hogs makes evidence disposal much simpler- One of mine would be in the manure pit at least once a day for a new perfume.