I recommend a nightlock (or similar) for your exterior doors. Even with breaching rounds and a ram, it will take a minute to get through (and give you some loud noise before the actual breach) and will probably need to use a saw, or explosives, especially if they arent aware you use this thing. This might give you a little time to burn/wipe/break whatever you need to. Not much time, 1-2 min, but better than 0, especially if you pre-plan. Obviously if you have first floor windows, gotta secure those too. Won't help you keep anything, but keep your property out of their hands at least.