Since you asked;
I would not trust that skrew tite system to support a flag pole, certainly NOT expensive glass modules. So much depends on the soil type I doubt it is going to be safe or long lasting.
I used DPW top pole mount racks on the farm on a 1500 watt 6 panel array.
I also used a modified sat dish mount, also on a pole to hold a smaller 800 watt mixed array.
Currently we have 7,700 watts (24 panels) on a Unirac ULA [Unirac Large Array] system:
Going from memory, the Unirack cost about 1/3 of the entire solar array all in and is UL listed for ease of getting approval by whatever authority you have to satisfy, as well as rated for 90+MPH winds. It is set in 5 yards of concrete and ain't going nowhere! It is basically a kit and you supply the 2" galvanized pipe it uses for structure. The ULA took 3 guys 2 easy days to install including panels plus a bobcat with an auger for an hour to punch holes.
That tracking system looks kind of silly to me. Designed to impress investors. Way too big a footprint to be sensible, too many moving parts.
For 4 modules, I would grab a salvage sat dish mount, stick a pole in the ground by normal means, add some angle stock to attach modules to call it done. You can make it track, too.
Just cuz you asked.