Electrical installation in the kitchen: what dimensions or zones?

The plan was also made by the kitchen planner for us. He even came by after the electrical installation and before plastering to measure everything again.

A prior kitchen planning would definitely be advisable. Otherwise, you might end up with the sockets for the cabinet lighting too high/low. The sockets for the work surfaces also need to be planned, as they may need to be properly positioned in the niche backsplash. Then there are the sockets for the electrical appliances; of course, they must be located later in a sensible "installation area," but above all, they should fit the kitchen.

So first plan where everything should go in the kitchen!

One more question, for lighting in the wall in the living room, what height is chosen there?

However you want it.

There are installation zones for this, aren’t there?

Never heard that word before :)

When it comes to ovens, you also have to pay attention to what the back of the housing looks like. I would also take a look at the back of other built-in appliances. For many devices, there is only space for a power outlet and a plug in a 15-20 cm strip at the back. Usually not in the middle of the housing. We had a dented housing and a short circuit due to neglecting this. The electrician was done by the craftsman. Kitchen plans were available.
If you also want to raise the dishwasher, two factors were important for us: leaking water must not be able to reach the plug, so that also needs to be higher, there is a regulation on the distance. Raised dishwashers require pumps that can overcome the distance. Most can, but not all.

Best regards Gabriele