I'd leave the country. Forget the 12 hours of being able to get away with anything: it gives someone the other 8748 hours per year to plan.
"I'd build a bunker," you might say, but someone really determined to kill you would figure out a way to get in beforehand or would prevent you from reaching it come 'Purge' time.
To keep yourself safe you'd have to live in complete isolation. I mean complete. No contact whatsoever. At that point you might as well pull up stakes and GTFO.