On the question of how do they work simple answer they add energy to the boundary layer keeping the airflow attached at lower airspeed to the surface of the main plane and the lower surface of the tail plane and each side of the fin this will reduce cruise speed a little. Drooping the ailerons is like increasing the size of the flaps.
This is done with little tri-angler vortex generators stuck along the wings ect. There's a tape which looks like the surface of a golf ball that can do this as well but have no data but can be stuck on the prop as well to do the same.