I decided to buy 2 of these and was able to build 1. The 2nd one will be be built beside the 1st one for the other car. It was time consuming because we live on a slope  our driveway was not leveled on our asphalt. We leveled our footings and epoxy the slabs to asphalt then drilled asphalt screws into the ground and then into the slabscement epoxy each layerscrewed them in. It’s pretty solid and doesn’t move. I didn’t want to cut into our asphalt so the alternative route I did worked out ) The ones into the dirt are actual concrete footings we madeanchored the pergola onto it. I love this pergola as it acts like a carport and makes the house pop  gave it some life. Lol. In high winds, I just open them slanted and it just blows into the holes.