Finally completed my ground mount - shooting range cover. Way over engineered but provides a nice, shaded area for target practice and the concrete pad keeps the creepy crawlies away when shooting prone. You really don't want to be laying on bare ground in this part of Texas.
Steel frame with 4x4 vertical posts and 2x6 lateral beams welded to steel plates in the slab. The panels are mounted to ironridge rails which are secured to the 2x6 by L-Foot mounts with 1/4 inch self tapping screws.