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I think that is the suggestion, because of the length of the support brackets. If you put this on the other side of the roof (ie: north side) the brackets would to be long enough to make the pipe vertical.
And that is the key. Whatever you do, the bottom line is the pipe that the motor mounts to must be plumb in all directions.
Other than that, anything sturdy that can hold up to wind load of a 30 inch disk will suffice.
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