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The cleaner way to do this is have the flange available to the tiler, and ask him to make slots for the screws so you don't have to drill through it. Drilling porcelain often takes a diamond bit...many will laugh at a carbide one. Cutting the hole by the tiler and notching is well within his capabilies (or should be). You ideally want the flange on top of the finished floor. Since you have a 4" pipe, I'll second using the inside mount flange.
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