I'd love to keep it there, but concerned that after I've added the flooring - the existing flange would be level with the floor - doesn't it need to be on top of the flooring? I saw a This Old House video and they used this https://www.amazon.com/Universal-Drain-950P-Toilet-Flange/dp/B005E0M8L0 - maybe I could drop that into the existing hole without removing the flange right?