We are planning to build in 2022; the planning begins

we have
- double satellite and LAN in the open space,
- power outlet in the kitchen island,
- power outlets in the window niches for decoration

Is the question serious? Two connections. Two devices simultaneously without a switch.

Above all, the question is: justified. One could just as well connect a wall box with two connections using two separate cables, and the manufacturers charge quite a hefty price for gluing them together, in my opinion. In case of doubt, you "gain" more rigidity in curves.

Above all, the question is justified. One could just as well connect a box body with two terminals using two individual cables, and in my opinion, the manufacturers charge quite a bit for splicing them together. In case of doubt, you "gain" more rigidity in curves.

Then I may have misunderstood the question. I thought it was about the purpose of using two CAT7 cables instead of one.

No, definitely not that: one single cable for a double socket is obsolete with Gigabit, as cable sharing is relegated to the museum.

Sockets will certainly be added in a few more places. For example, near your patch panel there needs to be a socket because the router, switch, ... need power.

For the cables, probably CAT7 will be used and the outlets CAT6. Have you already thought about how the router, switch should be mounted on the wall in the utility room? Cabinet or everything nailed to the wall. Your offered mini patch panel will only be for the latter. If it is supposed to be a cabinet, then coordinate the patch panel with the electrician in advance? Is a double network outlet enough for the TV? Depending on the level of technical affinity, there are sometimes 3 or 4 devices connected to the LAN and in a new building I would not start directly with a second switch. If a PC workstation is still planned somewhere, then LAN should be installed there as well. What is still missing are LAN outlets for the access points. I would provide at least one per floor. Preferably on the ceiling.

Where is the car parked? If a garage, then it also needs to be supplied with power. Even with a carport, lighting is not bad and an outdoor socket for example for the vacuum cleaner is also quite useful.

Basically, it looks quite OK and the rest depends on the floor plan and your needs.

There will certainly be a few more sockets added. For example, near your patch panel there must be a socket, as the router, switch, ... need power.

For the cables, probably CAT7 will be used and the outlets CAT6. Have you already thought about how the router, switch in the utility room should be mounted on the wall? Cabinet or all nailed to the wall? Your offered mini patch panel will only be for the latter. If it is supposed to be a cabinet, then coordinate the patch panel in advance with the electrician? Is a double network socket sufficient for the TV? Depending on the technical affinity, sometimes 3 or 4 devices are connected to the LAN and in a new building I would not directly work with a second switch. If a PC workstation is planned somewhere else, then LAN should be installed there as well. What is still missing are LAN outlets for the access points. I would provide at least one per floor. Preferably on the ceiling.

Where is the car parked? If a garage, then it must also be supplied with power. Even with a carport, lighting is not bad and an outdoor socket, for example for the vacuum cleaner, is also quite useful.

Basically, it looks quite OK and the rest depends on the floor plan and your needs.

Thanks to everyone for the feedback. A general question: Why should I spend several hundred euros on more than two sockets for, e.g., the TV, when I can just buy a good power strip and then connect the Xbox, Amazon Fire TV, etc. through it?