Now why would you even consider installing an all plastic flange which could make you do it again someday?
Don't use the spacer, install the cbu and extra subflooring THEN install the flange. Notch the tile so you don't have to drill through it. The flange is designed to be supported by the FINISHED floor, not be embedded in the floor.
Baron said:The flange should set on top of the tile?
Baron said:Where can I get an ABS Flange with a metal ring (preferably stainless) on-line ?
Toilet flanges are designed to sit on top of the finished floor...doesn't matter what kind of floor it is. There are lots that aren't; doesn't make it right.