I have a Toro system with rotors for the front yard. I need help in replacing one of the rotors. I installed paver stones around a flower bed where one of my rotors is located. The two paver stones are a total of 6" high and the current rotor can not clear them. What model/type will pop-up 8-12 inches to clear this height? I only need about 15'-20' of distance off of this head with 90 degree rotation. Would like the head to start flush to the ground for aesthetic reasons. Thanks.