ᐅ How to cover a pre-wall installation for a toilet?

Hello everyone,
I will soon be building a wall-hung toilet frame that will be tiled. Now the question is, since I am supposed to use double plasterboard layers;
how does this affect the depth settings for the water supply, waste connections, and manual flush actuator?
With the double plasterboard, everything is about 13mm (0.5 inches) further out.
A console from the company Geberit will be used.

Make it easier for yourself and choose the Geberit Monolith!

Does not fit in this spot, as it is in a corner, angled at 45°, and about one wall thickness of 1.20m (4 feet). At this location, the monolith does not look very good.

No problem with corner installation either, check out the pages of Grumbach corner WC stone.
There you will find exactly what you’re looking for!!

Hello Tubifex, as I already mentioned, the width of the corner is about 120cm (47 inches) and it is also located under a sloping roof. Unfortunately, this does not answer the basic question regarding the depth adjustment of the control elements...