Agreeing with @bmoran4 and adding to that, you could also power each of the two loops independently, with one brick each (with or without a PowerMaster) to limit each loop to 10Amps max. In which case you'd still want to ensure correct phasing throughout and would need to isolate the two power districts.
If the bricks were wired in parallel, then you'd have 20Amps available. Personally, I prefer to limit the current to 10Amps max, even with fast circuit breakers.
