I just built a double grill table and used Polyeurathane on the top that holds the grills. I'm a little concerned with the heat coming off the grill that it start a fire with the Polyeurathane. Have you had any issues as such? I am using 3 inch L brackets that keep the grill about 1.5 inches above the table with maybe a 3/4 to 1 inch clearance on the side of the kettles.