i dont know, put the panels on the roof and you get maximum exposure
my parents have solar panels on their roof and i HATE it
we are talking a 19th century farm house here, no shingles, but red clay roofing tiles
then again, my electric bill last month was in the $400 range
my dads panels make more power in the summer then they need and his meter will actually roll back
usually enough to break even in the winter
he hasnt paid for electricity since they installed that eyesore