Kitchen cabinets on drywall

If it is 1 x OSB and 1 x plasterboard, then ordinary Spax screws are sufficient.

double-layered plasterboard wall

The question is, what do you understand by a double-layered plasterboard wall.

I would spontaneously claim that if it were also clad with OSB, the question wouldn’t even arise.

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Regards Sigi

Yes, that's how it is. According to the current status, the wall is covered with 2x12.5mm drywall.

I had also seen the HM anchors, but then decided on the even stronger Knauf or Tox anchors. However, I am not worried that the anchors will not hold, but rather that the drywall will not withstand the load. Looking at your graphic, this means a load depth of 20cm for a 40cm deep wall cabinet, resulting in 85kg/m. So for my 2m, that would be about 170kg for the wall cabinets.

Theoretically, wouldn’t it also be possible to attach the mounting rail for the kitchen cabinets to the metal stud with a suitable screw, in addition to the anchors? I can still see the filled screw holes for the drywall boards...

Shouldn't it theoretically also be possible to secure the mounting rail for the kitchen cabinets not only to the dowels but also to the metal stud with a corresponding screw? I can still see the filled screw holes for the drywall panels...

In our last apartment, the wall consisted of a natural stone wall and a drywall mounted in front of it.
I hardly believe that the kitchen installers managed to get a dowel into the natural stone, so the cabinets were hanging on the drywall wall and at best in plaster. However, the cabinets were not quite as tall.

Therefore, I think a double layer of fastening should be quite stable, and if you also "hit" the stud, it certainly can't hurt.