Would be nice if we started with the actual marginal land and not the marginal land in real estate terms. Roofs for a start. Parking lots next. Really no reason why any and all industrial land shouldn't look like a pure sea of solar from orbit. Every square inch is low hanging fruit no one would complain about a solar panel going in there.
The best land for solar farms tends to be in the desert where there isn’t enough water for industrial use.
But it's literally not low, it's up on a roof. The ground installs are preferable because they are low and easily accessible.