I’ve posted before on the topic of moons. See also:
One moon would have to be further out to not collide or get tossed out and thus have stable orbits. Plus all the pictures indicate one closer than the other.
Agantyr from the Merchant Calendar program mentioned this to make sure they had stable orbits. Depending on what your synodic periods are will determine the sidereal period and thus the distance per Kepler’s third law.
I guess the real question here is how the moons may impact geology on Athas.