Completion of the wastewater pipe in the bathroom

Hello everyone,

first of all, thank you very much for this great forum. It has already helped me a lot. But now I need your help again directly. We are currently converting part of our stables into a small bathroom and in the adjacent workshop there will be an additional sink. I am currently laying the wastewater pipes for this and I am facing a question that is probably very simple/trivial for you: how exactly do the wastewater pipes coming out of the wall terminate? There have been far more difficult questions, but this small detail is really making me despair.

I run vertically from below into the timber stud wall. Do I then terminate with a standard DN50 90 degree elbow and have it end flush with the later tiles or slightly set back into the wall? Here is the product: [Geberit 90 Grad Bogen]

Or do I put a connection adapter on the 90 degree elbow and then possibly cut this flush with the later tiles? [Anschlussstutzen]

Or do I take a 90 degree connection elbow directly and then cut this flush with the tiles later? [90 Grad Anschlussbogen]

I hope you can help me a bit here.

Best regards
Simon