How are pass strips or corner solutions installed?

By the way, in your dead corner I would support the countertop with an adjustable support leg. A ladder fixed to the wall serves the same purpose, but I find it not so easy to get it to an exact height.

Thanks for the tip.
In my current latest version, I have placed an 80 cm base cabinet in the dead corner, see picture.

I want to mount a 30 cm door on the front of it, so 50 cm will extend into the dead corner.
That shouldn’t be a problem for the countertop anymore, right?
Regards
Section Chief

Yes, then the panel is sufficiently supported.
This is how I have set up my corner:

YouTube.com/watch?v=dTU_3h2ykRg

Cool, especially the lateral sliding of the pull-out door is clever.
Are you a carpenter?
Regards
Section Chief

No, only DIY enthusiasts.

Ikea expert, I have another question for you:
How do I mount the countertop in the other dead corner next to the sink, see picture:

Unfortunately, this corner is completely dead, I have no idea how I could somehow use the storage space in the corner.
Next to the sink is the dishwasher, even if I swap sink and dishwasher, it doesn't help me. And I don't want to have the 2 symmetrical 80 cm base cabinets left and right of the cooktop any differently either.
So I leave a completely dead corner there.
How do I mount the countertop there?
Since the countertop also goes a little under the sink, there must be a separate countertop piece in the corner and it cannot be one piece all the way to the cooktop, right?
Is it advisable to place an empty e.g. 50 cm carcass in the dead corner and lay the countertop on top? Or do you do this with adjustable feet? Are there such feet at Ikea, I haven't found anything on the website?
Best regards
Section chief

Please upload the complete floor plan with the cupboards, that makes thinking easier.