There are different types of solar panels. There are Trackers, Ground Mounted, and Roof Mounted solar panels.
Solar Trackers: Solar Trackers increase the amount of energy produced by getting the maximum amount of exposure to the light. They sense the direction of the sun and tilt the panels towards the rays.
Ground Mounted: Ground Mounted solar panels are held in place by racks or frames. They are attached to ground based supporting mounts.
Roof Mounted: Roof Mounted solar panels are held in place by racks or frames attached to roof based supporting mounts.