As I am getting for another bad New England winter, I clearly remember my last one, when we just got minisplits installed. It was daily duty to shovel them out. One installed on the North side would get bunch of wind-swept snow off the roof above and so would the one on the East side.
Unfortunately, I did not know it was possible to mount them on the wall, so they are sitting on concrete pad HVAC people installed it on. Maybe I wold put lattice on the side where prevailing winds are from and try to keep snow off it that.