AC Out 2 on Parallel Multis 230V

Hi! I have 2 Multiplus II 48|5000 - 230V (one is actually an EasySolar II GX) in parallel. I want to set up the AC Out 2 Relay to start a water heater based on SoC. Should I configure the same assistants on both of them? I have only configured the Master unit and the water heater only draws power from that one which I don’t want. I want both of them to supply equal power to both AC Out 1 and AC Out 2.

Thanks!