Are you wanting to add an additional beetle drawer to your current setup, or for a kit you are also purchasing with this order? This beetle drawer is ready to go. Just snap it on to your kit wherever you want it. We always recommend keeping the beetle drawers on the top. If replacing a beetle drawer you only need one drawer with the screened bottom. If you are buying a beetle drawer to addon, you will need an additional drawer to collect the baby mealworms for this drawer as well. It can be ordered on our website.