Alternatively, you lay them out in north-south rows (like a fence) and they generate most power during morning and evening, when sunshine comes from east and west.

Coincidentally, their power maximum is when conventional solar parks are not yet producing or no longer producing.

Coincidentally, this also matches the ideal agrivoltaic setup, where you use almost zero surface (the panels are vertical) and grow plants between, not below solar panels.

I wonder how well it would work to use mirrors for more sunlight than just natural reflections.

Bifacial panels have been in use for several years in utility-scale solar installations because its cheap enough to do that the modest additional electricity generated is worthwhile.

Unless you plan on putting up some books and comics for voles and grasshoppers on the backside of those panels, that space is really useless.

Do not underestimate the importance of land use, it's always been very important and it will be very important in this century.