Sign up and just add another user to your account. Their limits are soft and they probably won’t bother you if all you have is an extra user. Tailscale is fair and flexible this way.
This is a store open 11am-6pm Monday through Friday, located in a middle of nowhere office park. No random walk-ins will be happening since this isn’t at all near an established retail district where people wander around.
It’s a “tech demo/test” for future stores that may be built but the only “customers” will be Facebook employees.