Hope you picked it up free.........
Single point mounts tend to move around.
I'd be inclined to go with a 3 point mounting type similar to what we use here.
Main support rotates up and down on the base and 2 rear support arms are telescopic and once dish is set, a zipper ( self drill) screw locks it in place.
Bluejet
You see the picture of dish and see picture of the mount how low should put the mount on the back of the dish.
see picture of the mount again.
mrel