I use that same mount with both support legs "downhill" from the main mast. It works okay for me and my level hasn't changed since June . My logic had to do with the possibility of wind unseating my dish more easily if I had the supports uphill on the roof. I'm using an hh90 motor with a fortec star 80 cm dish.
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Searching the sky with a Fortec Star 80cm dish, Invacom qph031 quad LNB, STABS HH90 motor, on
a Buzz Plus .
And a Fortec Star 90 cm dish, Invacom QPH031, Moteck SG-2100 and a Mercury II.
The official neighborhood crazy guy ! 
"I shop at Sadoun Satellite Sales www.sadoun.com "
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