HQST Adjustable Solar Pannel Tilt Mount Brackets for Roof, RV, Boat and Any Flat Surface,for Off-Grid Systems

why the 150W limitation? Is the limitation really weight? how much weight they can handle?

Let’s say I have these facing toward the east for sunrise, can I then tilt them the other direction as the sun goes west?? Thanks

How is it secured to the soil ground?

Can feet mount to 1 5/8 strut channel?