I have installed a 240v wall heater in two separate rooms. Each has a single pole wall mount thermostat (from the same manufacturer). The wire is 10-2. I am planning on running them both from a single double pull 20 AMP breaker.
the stats are:
each heater is 2400W max which would imply 10 AMPS max each
each thermostat : 16 max AMPS inductive continuous, 3840 max watts
I am planning running the 10-2 from the panel to a junction box near the closest heater, then running parallel cable to each thermostat/ heater.
My questions are:

Is a 20 AMP dp breaker adequate, or do I need to follow the 80% load rule & go to a 30 AMP?

Since the wiring to the heaters is single pole, does it matter ,from the junction box, which load wire goes to each thermostat (or to each heater)?

Below drawing is just a crude sketch - standard 10-2 cable was used



heater wiring.jpg