All of these items are expensive solutions to the application. I wonder how many of the roof mounts they sell. It requires basic roofing experience, which as a long term installer, I have. But, how about these low ball fulfillment hacks? Installers who have roofing experience already know how to install for a waterproo seal. Cable entries can be made through the downslope of vents and under eaves. The thing looks like a glorified roof can vent.
For 18 inch dishes, a vent pipe adapter is a good solution. Even a cellular PVC DWV 2 inch nominal vent will support a Dish500, a Dish500 or a Phase III DirecTV dish.
For rafter end eaves, a use a cutoff saw to cut off opposite corners of the mounting foot, so that the mount does not extend below the side of a standard 2x6 rafter.
Mounting on the side of an eave is secure, as long as you put the 3 inch center lag screws into the rafter tail.
A much cheaper and better alternative to the screw in ground pole is an 8 foot chain link line post at $9. Dig a 8 inch x 6 inch deep hole. Auger the center 3-4 ft down with a 2-3 inch diameter auger. Place the pole and plumb it with dirt up to the bottom of the larger diameter top hole. Fill the top hole with about one gallon or 15 pounds of concrete, mixed ultra dry. Tamp and it will support the dish in a half hour. When it comes to removal, dig around the concrete and smash it with a sledge hammer. Remove the concrete. Waddle the pole and pull it out.