✅ Roast Tray I Use (Amazon paid link): br Disclosure: Some links above are affiliate links which means I may earn a small commission if you click and buy, at no extra cost to you.br br Ninja Support: br Is it safe to stack the ovens on the Ninja Double Oven (DCT451)? Yes. This guide shows which foods and functions belong in the top vs. bottom oven, the exact rack levels and accessories, how to sync finishes with Smart Finish, and the airflow rules that keep results even and smoke-free.