I have similar situation with a possible significant difference.
I'm a "Snowbird" who now has an Obi 100 at home A. I've been physically taking the unit to home B for six months of each year.
I'd like to leave the present unit in home A, buy a second Obi and leave it in home B. The unit in home A would be disabled ... no power, no connection to the internet, when I'm at home B. The unit in home B would be disabled when I return to home A.
1) Can I do this, and continue to use the two Google Voice numbers I now have?
2) If doable, is the solution simpler than that for the original poster's situation?
3) Which Obi unit best supports this? (The one I plan to buy)