Given the weight of the craft and thin atmosphere, I would be surprised if there was any noticeable surface disturbance anytime outside of takeoff/landing.

Wouldn’t a thin atmosphere cause more disturbance? Naively, something thick and soupy is easier to push around than something thick and heavy.

Atmosphere is required to carry the energy that would cause disturbance. With no atmosphere, there are few molecules in the space around the copter to transfer the energy to the surface.