Reddit mentions of Crime Prevention Through Environmental Design

You could think about prewiring doors & windows for sensors, with the wiring terminating in an interior lockable closet for an alarm box. You might also want to prewire inside/outside sirens, AC/battery interconnected smoke alarms, and likely locations for security cameras. I'd pull Cat 5 or Cat 6 back to the same closet, you can run power + video or power + IP on a single strand of Cat 5/6. Also good exterior lighting, and extend the power/network wiring to the detached garage, so you can have a camera on the house watching the garage, and a camera on the garage watching the house.

While you're spec'ing out building materials, it's a good opportunity to choose doors + windows with security in mind - security film/glass, strong doors, good hinge/latch hardware.

If it were me, I'd think about building a low-budget saferoom - doesn't have to be Hollywood star quality, but an interior closet with a sturdy door, and a phone/Internet connection inside, room for a few people + a gun safe.

I'd be inclined to make the windows tough to look in from the outside - with thin but unpleasant bushes (like rose bushes) underneath so people can't hide there, and don't want to be there.

This book might be of interest:

https://www.amazon.com/Crime-Prevention-Through-Environmental-Design/dp/0124116353/