Yes, keep in mind that each "hot" should only be pulling a max of around 18A (2100W peak / 120V = 17.5A)
I figured this would be fine since most homes are run with 15A circuits and 14 gauge wire.
Each wire
could draw 70 A which would overheat the wire, melt the insulation and possibly start a fire.
The proper way to do what you want is to run properly sized wires from the 70A breaker (6 ga, I think but look it up) and put in a sub panel with individual breakers for the plugs you want to connect.
IANAE (I am not an electrician), but I did work for one during college.
imho. should be running 220. a 30 amp breaker with a server strip and c13 PSU plugs would do the trick for 2 easy