Can I use a burner on top of cool crete?

Would you put a piece of plywood under it or would you be afraid it might catch on fire? If you're afraid it might catch on fire, then I wouldn't put your burner on the deck.
 
Just north of Baton Rouge. Actually right where the hills tunica hills begin. High seafood availablity year round. When not boiling blue crabs, shrimp, or crawfish; we splurge on snow crabs. Also like to pick up a boat sack of raw gulf oysters. Now we have an outdoor kitchen/bar and a pool to do all of this next to.
 
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