My understanding of the law is that it only applies to renters to the extent that they have exclusive control over an area--like a balcony or a patio. Also, a landlord can forbid you from damaging the property, which means no bolting the dish to the side of the building.
The dishes can be ground-mounted. Assuming you still get a clear southern view.
As far as the "niche market" comments...I see a LOT of these dishes as I drive around, a lot of people have them. They're not niche.