Plants need direct light to grow… most need full sun. Personally all the solar farms I’ve seen just “grow” grass and everything is kept trimmed down to not cast shade on the panels. Putting the panels up higher would still cast any plants grown in deep shade. I think putting them in places deep shade is needed/wanted on the ground makes sense and because cities tend to be hotter due to paving using solar panels to cast shade would help lower the temps in cities, lowering power usage on things like AC. I think integrating solar into urban landscapes is the future