I have an ABS toilet flange in need of repair - the slots in the flange that hold the closet bolts have partially broken. My repair ring is the Lasco 33-3736. It looks very similar to the Harvey 014710. Are these meant to be installed over or under the flange? On my Lasco, the packaging illustration shows it mounted above, but on the Harvey, it's shown mounted below the flange. Would under-mount hold the bowl to the flange more strongly?