I just lay them directly on one of the racks, lined up in rows. They don't fall. Actually, I just leave them in there all the time. I brush off cornmeal which would burn otherwise, and I also have to be careful because my oven puts on the broiler automatically when it's preheating unless I do a timed bake. I thought it might break the tiles if they were broiled. So far so good. And like I said, only 39 cents each, so the whole thing costs only $2.50! I bought extras so I could put some in the other oven if needed. We also tried them on the barbeque once when it was really too hot to cook, to make pizzas outside. I think it would work, but there was a problem with the tiles getting too hot. I think it's worth investigating further.