The draw on 2800W @ 120V is 23 Amps. Definitely more than the standard 15-20 amp breakers you find in houses now a days. You'd have to have your power supplies on two different circuits. You could also drop in a new 30 amp breaker if you had the room.
30 Amps means gauge 8 or 10 wiring. Much cheaper to do gauge 12 and a 20 amp breaker on 240V. Most PSUs are more efficient at 240V too.