This isnt a pretty project, sure it could be done a lot more professionally. I had a very niche need for a square ground cover with a hole in the middle, The shelter im putting together is based on a enclosed tarp shelter, https://www.youtube.com/watch?v=t_TTAAzvybA using a central pole. My one is going to be bigger and will be using a 4m x 4m tarp. so i wanted to use a stake driven into the ground.
it consists of two plates with the ground sheet sandwiched between the two, the hole is 70mm (2.75 inchs) Not shone is a tennis ball with a x cut in the bottom, which is used for the top of the pole.