Yes 222,622,625,722, even 322's.
But 2 doesn't matter, I've had 2 Dual room DVRs for 3 years, and 1 was only ever plugged in even when the phone line fee was inforced, and never had an issue.
Everyone complains about the audit team, but thats mostliky because something is fishy, Like 4 or 5 receivers on your account.
Most people don't need more then 4-6 rooms tops of service.
10 rooms , I'd start asking questions too.