Get a metal drilling bit (i used a step bit, but you can just use something like these(https://www.amazon.com/Bosch-CO14B-Pc-Cobalt-Drill/dp/B07Q9HNTBH/ref=sr\_1\_11?gclid=CjwKCAjw2rmWBhB4EiwAiJ0mtZU3x\_jO2OzyD\_W1pgR3Iep3q2Ej9a97Y\_y284O52cRDg8\_Ez0p61BoCMYgQAvD\_BwE&hvadid=282549330448&hvdev=c&hvlocphy=9021462&hvne...) and an impact driver. I used that, hardware cloth and Sheetmetal screws along with chicken wire, then threw rocks around the side. Basically the same metal foundation on our TOUGHSHED.
I'm using Bosch cobalt.