Only one that slowed our breachers down with just a ram was a steel frame, steel apartment door in a concrete block wall. And he was knocking the frame out of the wall when someone finally agreed to open it.There has ever only been 1 door I could not get open. Ive used rams on metal doors with metal frames and got them open in less then 5 hits. The one time I needed to pass the ram after 15+ hits was a regular steel door you get at home depot and a regular door frame. The guy screwed a 2x4 strip on the inside of the door jam where your molding would be there was well over 50 screws holding it on. We neevr got the door open we ended up using an alternative breach point thru a window. It didnt look pretty but if you hada little carpentry skills you could prob. make it look ok and nobodys kicking that door in not even the police. Since then we now carry breaching rounds Id like to have another crack at that door with the breching round but im not on the team anymore.
Contact the PD; many have community resource officer or crime prevention officer who will come out, and walk around your property with you, and offer suggestions and guidance. Nothing beats a knowledgeable person looking at YOUR house and grounds, and offering suggestions.
Alarm systems are good tools, if you keep them maintained. So are alarm company signs, if you know what I mean.