360 degrees could be with an elevation of just 1 degree above straight down. It will have a 360 degree train potential, but it will have to be blocked from firing into the prop diameter when trained forward port and starboard.
It seems like the gun would be able to fire right through the props though.
Should be simple to detect when the bullets would hit a spinning blade and when it would pass through.
Rate of fire would slow down when going through the props though...or at least be a bit irregular.