Dual Pain Cave Set Up

Anyone have any suggestions on the most economical way to set up two trainers? My husband decided he really likes Zwift so we ordered him his own Kickr because he wants to use his mountain bike instead of cramming himself on my teeny 48cm 9-speed road bike, swapping pedals and raising the seat post every ride. I’m running my set up through Apple TV. We have an extra TV but no laptop. If he runs Zwift through his phone does it mean he can’t use the Companion App? Are we better off getting another Apple TV? Will there be interference between the Bluetooth connections? I’ve also got a Wahoo cadence meter and HR monitor. He won’t have these at least at first.