I use circular polarizers on all my drones. I've been doing this since are started using drones. I fly over a lot of water and love being able to see what's underneath. If I need to, I change the angle the drone is to the sun to block the glare. I do love the better color saturation it gives as well.
Just bought some Freewell PL filters which I'll be testing next summer for exactly the reason you mentioned. However, There are times you want the reflections.
This was taken just a few days ago with a Neo.
Mini 3 Cinematic Achill Islands and County Mayo