Any reason not to use this? Its a new installation and its currently roughed just to the closet bend. I need to add a 4" pipe straight up through the floor and then a closet flange... I don't want to use this if it's not ideal, but it seams much easier and seams like it would be fail proof in lining up.
Also, the floor is finished so I'll have to drill into the tile. Should I use all the holes on the flange, or just say, 4 of them?