This is more precisely a 2-on-1 handicap match, as its us against him.

Anyways, get under N3 from the side, flip it, and try to pin it against the wall so it can't self-right. If it does, flip it again and press the pit release button. Let Ripper Evo distract it, then flip it over and pit it. If that doesn't work, flip it into the house robots or try to flip it OOTA with both of our flippers if need be.

If he manages to get under one of us, clamps us, and tries to pit one of us, the other will flip N3 and the robot he's grabbed. N3 will have to let go to self-right, as the shape and weight of the other robot will severely restrict his ability to roll-over or use the crusher to self-right.