How to clad the WC pre-wall element?

Hello everyone,
I will soon have the task of building a pre-wall toilet, which is to be tiled. Now the question arises, since I am supposed to double-board;
How is it with the depth settings of the supply / wastewater and the manual operation?
With the double boarding, everything sits about 13mm further outwards?
A console from [Fa. Geberit] is to be used.

Make it easier for yourself and choose the Geberit Monolith!

Does not fit in this spot, is in a corner, angled at 45°, and about a wall width of 1.20 meters. At this spot, the monolith does not look as good.

No problem with corners either, check out the pages of Grumbach Eck-WC-Stein
there you have what you are looking for!!

Hello Tubifex, as I already wrote, the width of the corner is about 120cm and then under a sloping roof. And unfortunately, this does not answer the fundamental question of the depth setting of the control elements...