At "home" I have three Star Pickets driven, as far as I could, into the ground.
You may need to borrow/purchase a post driver (I call it a "donger") and the Star Pickets
Place your aircraft where you intend to park it - mark the points where you will drive the pickets in. Remove aircraft to do the driving.
Drive the pickets, at an angle away from (not straight down as in fencing) the aircraft tie down location. This is the same concept as pegging a tent .
The tail picket is left as is, with the two wing pickets reduced (cut off) to easily clear the underside of the wings. Smooth the cut off edges, they are razor sharp & will do a lot more than bark your shin, if you inadvertently make contact. I go to the next level and put a plastic high viz cap on each picket.
The tail picket is perhaps .5m behind the tail ( you may go further back for your nose wheel aircraft/tail in air).
The two wing pickets are placed, so that the tie down straps are in front of the wing and at about 45 degrees out from the wing tie down. The concept is to remove all slack (without undue tension) on all three straps.
I use cam buckle load rated straps, with metal hooks at each end, purchased from Bunnings Aerospace, to do the tying down bit. You may find that the hole in the star picket will have to be enlarged to accommodate the hook. After tensioning down the strap, I use the surplus strap to go round both ends of the hook eye and tie off, as added security
A D shackle or two may help with the tail tie down.
I carry a separate lightweight kit for temporary tying down, when on an away trip.