Smarthome is always good for gadgets.
Are pets allowed? Pit bulls really aren't all that big, but they're universally respected.
Twin cheap camera's outside your door that show each other would be pretty cheap... with a small sign that showed a badge to get attention, and said smile, you're being recorded by wide angle cameras that also record each other.
ADT stickers are excellent when conspicuously placed.
Smarthome also sells wireless panic buttons that will dial emergency response automatically.
And my personal favorite; a good face to face conversation with someone your husband's size is good for the fear of God... He could simply look dangerously angry while asking the neighbor(s) to let him know if they ever see anybody creeping or peeping around because "
it happened last night... and I'd like to kill whoever it is. Thanks."
Sorry you live next to a creep, ((((((SheWolf))))))