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Putting the panels in a less visible area is a smart move to avoid conflict with the neighbors. In places with a lot of land like west USA it probably does not matter so much.
I own an apartment in the UK, and inquired about putting PV on the roof. There were two reasons why the answer was "no": (1) leasehold, (2) conservation area.
Theoretically, the neighbours who installed satellite dishes (tiny ones!) were in violation of the latter, though in practice nobody seemed to care.