bump?
In the long run, the more 220 circuits you can start using the better off you'll be.
220 x 20A = 4400watts. de-rated to 80% for 100% duty cycle = 3520 continuous watts of load on a single circuit.
2 D3's and an L3+ would put you at about 3200 watts.
on the 120 / 15A route, 1440 watts per circuit max, so one miner per circuit no matter what.