Sorry Mr.Turtle...I saw on the cheap and figured this would be a cheap way to be super cool and have sun "chasing" PV,s...Btw they used to make 4'ers as well and these as well as the larger units tend to be cheap (as people these days tend to consider them eye sores and a nuisance eating up their valuable real estate) or "if you want to get it outa here you can have it". But any these units would allow for a mount that keeps up with your collection of PV's. Ie. the four footer would easily handle four arrays of the type you have...start with one add another when you can and so on...I realize this isn't practical for a big city type apartment building. But I have seen these dishes mounted on homemade trailers, so for a rural type apartment or a duplex could be practical.
And that's the last you'll hear of this from me here

(elsewhere may be another story

)