A:Answer NO, NO,NO! If you put an aluminum liner on the bottom of the oven, it will MELT and it will be stuck on the bottom. I know this because my wife did it after I had told her not to put anything on the bottom. The heating element is below the flat portion of the oven and that flat area is extremely HOT. If you want to put a liner, put one of the racks on the lowest setting, then put the liner on the over rack, but NEVER directly on the bottom of the oven. I would suggest not to put anything and just wipe the bottom once the oven is cold.