HELP! I am installing three 4000 watt in-wall heaters and I would like to connect them to one thermostat?

I am installing three 240 volt 4000 watt in-wall heaters for my basement. They all have built in thermostats but I would like to connect them all to one thermostat. I don’t know if this is possible because I know at 4000 watts each that is too much power to run to a single breaker so I was going to run them all seperately to a 20 amp breaker for each unit. But is there any way for me to do this and still connect them all to a single thermostat? if so now, or is there other options?