Motion detector lights outside, and make sure no windows and doors are not hid buy landscape.
Alarm system, weather you have one or not get a sign for the front yard.
Model 88 maverick 12 gauge shotgun, the racking of the 12 gauge is a universal noise that every bad guy knows.
First two rounds are beanbags/rubber bullets the last three are slugs.
If the wife is not comfortable with a gun many tasers come with a laser dot sight and 30ft range coils now.
Most doors on houses are easy to kick open, outside of a metal framed door, Larson offers a full view shatter proof glass and additional lock storm door, It's about $300, and adds a barrier that would cost a bad guy time to get threw. I truly is about making your property less of a target, a few simple steps and the bad guy will drive on to an easier target.
I also strongly suggest a CCW class.
Guns stored in a properly secured in biometric locked safes in a bedroom can be stored safe from children, ready to go in a moments notice and not be taken while you are gone.