Several have complained it doesn’t work while a couple of user have success. I believe first part is you need the subscription in order to stream over your network. Then you have to use a fixed IP and enter it as the TV connected devices don’t have the same network discovery. Presumably this is where users get lost.
It’s not really a hassle to have more than one tablo. Well, I don’t know about the two different platforms.
If your concern is a back, have each mirror schedules. Yes this would be a PITA.