We are putting in flooring in our laundry room that is located in the basement. The old cast iron cover was removed and we are looking for the best option. We could put a new plastic cover on, but it sits below the flooring height. Everything is also so rusted that the old screws have broken off in the original drain. Can this just be placed in and sealed with silicone since this drain is under a utility sink and not where you would walk? How should this be finished?