I would also think about motion detectors, that flash on lights as they sense motion and also put the pictures on a computer at home in a hidden, locked room.
I would also go to some security companies and ask their opinion.
My brother owns such and has firm ideas on what should be done. And I'd also think about inside hidden "nanny" cameras. They are tiny and easy to hide.
If I had some cash to spare, I'd put in new windows with metal guards on them if I lived in the country, and new doors with wood or plastic over metal, and bigger door sidings.