I built a ranch style concrete bunker when I came home from the navy. I agree with many of the suggestions about looking the part of a hard target. Predatory criminals are like any other predator they want the reward with little risk and least amount of energy expended.
Dogs are the best alarm system very hard to bypass. Making it noisy to get into your home should be the first step. To get in my house you have to break something or many somethings. This takes time and makes noise and is likely to make the dogs very angry.
Fake cameras are cheap and make a good deterrence as well.