A 30A ATS is a very common part. Did you search google?
Most if not almost all are relay based and may not switch in 30ms. Consider that you want all relays contacts to break before any make. 30ms seems rather quick.
My DTV receiver will reset when power is switched on my rig and it then takes several minutes to activate again. I'm considering a dedicated inverter for the receiver and TV. I don't care about inverter inefficiencies when on shore or gen power and the charger is more than adequate to power the inverter and batteries. And when I'm running on battery power only - well I'm running on battery power.