Some years ago, after the beach house was broken into... I got some of those squealing things and motion sensor lights.
Another thing I did was to take some fishing line and sorta bundle it in a messy tangle down the side walkway of the house, with some cans fulla rocks tied here and there in the thing. Was a noisy tanglefoot. It was right under my bedroom window, and nobody was going to be able run, walk or crawl through there without making a heck of a racket.
I have seriously considered planting holly outside the jedis windows. But I worry if there was a fire and they had to get out, I'm sure they still could but would be painful.
I'm reading about torsion leaves...