Adding a 2nd room

I’ve had good success using Roomie v6 to setup my theater as a standalone room. I have several other systems around the house that are controlled using Harmony Hubs. Next week I am upgrading one of those rooms and the equipment I’m using can’t be controlled via IP from Harmony but can be controlled by Roomie. Can anyone direct me to the instructions for how to setup the iPads for a two room system so they are dead reliable? The second room is used primarily by my family, so I don’t want any problems. I’ve been running a second iPad Air with my theater as a test and sometimes it doesn’t seem to sync with the primary iPad or seems to cause issues with power on/off sequences where some, but not all, commands get executed.