Not familiar w the auger anchors. They buried under each post?
eta
Bunch of styles came up via the googler. Main walls cabled to them?
Bolted to them.
They had a neat machine for screwing those into the ground. It was a BIG electric motor that was geared real slow. Had lots of torque. They had to brace the motor end to a post, or it would have just spun the two guys around holding it.
About a foot down here, you run into a real hard clay. I've twisted off many shear bolts digging post holes with my tractor PHD when I hit that clay.
