Well, apparently they have a stall of 130a, at I assume 18v? Seems crazy high to me, but the 30a series of Electronize can, going by their website, take a peak of 570a and handle 90a for a short amount of time.

A single one would probably be fine, as it's likely (unless something goes very wrong) that the wheels would just spin before the motor would stall completely, saving the ESC. Though, in the arena, anything can happen.