What if your neighbors are Democrats?
“What if your neighbors are Democrats?”
In South Africa the whites kept dogs; they can detect them further out.
Use lots of parsley, sage, rosemary and thyme...
Seriously, this is where your planning comes in. Determine who you can trust, have them over as house guests a few times, and make the determination that if they're good folks, let them know they can hole up with you. There is safety in numbers; all that lone-wolf crap you hear from "patriots" is just their epitaphs.