OR...... you could opt to live in a mountain community, situated in an EXTREMELY defensible, natural terrain that yeilds only one way in, and one way out by vehicle traffic. But I wouldn't know of such a place, can't help you.

That limits your potential to move about if needed outside the safety of your compound.
4' fencing?? Dogs can clear that, any type of security fencing raises flags.
Consider berms set X distance from the home you can utilize as defensive fire positions, have vehicles laying around the area that can be moved in to defensive positions too.
Unless your home is fireproof, window bars afford you no exit in an emergency. Well placed bushes like roses, silver leadplant or sage under windows. These natural to the state bushes give not only cover to the homeowner, but make it difficult to get through by an aggressor. Have emergency exits you can get away from the house, dug out of the foundation or walls below eye sight and through bushes or trees.
Solar powered security cameras placed in areas you do not have a clear field of fire help.
Dogs are very good first alert systems, however consider geese. They eat less make a ton of noise when disturbed , no one would look twice at them wandering around the area. AND they are a good source of food.