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The minimum I would suggest is feet with a paver stone. Never seen a fire with that set up.
Even better would be fire bricks and feet. This is based on reading post only.
My 2 cents worth... The Egg can get very hot on the bottom and that heat WILL transfer somewhere. While the fire brick will do its job, for me, the feet allow air circulation to assist with the heat dissipation. My Egg's paver the feet sit on can get very warm (if not hot) after about 4 pizzas cooking at 500 degrees. The bottom of the Egg is so hot it would cause serious injury if you touched it. I'd bet there is over a 100 degree difference because the feet provide air flow (sounds like my next "red neck test" will be the temp difference!)