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Air Fry works best on dark pans because they get and stay hot very quickly. Shiny foil reflects heat of the bakeware, which may change your results.
When cooking with the ReadyCookTM Air Fry Tray, we suggest putting a baking sheet on a rack a couple of positions below your tray.
You can line that sheet with foil or parchment (or both) to catch any drips or crumbs, but you should never put aluminum foil, liners, or bakeware on the oven bottom. Items in this location can cause issues with air circulation and direct heat in any oven.
Always keep the bottom of the oven clear so the air can circulate properly.