How many power outlets are behind the TV?

So normally such circuits are protected with 16A. That means about 3680 watts.

You can easily connect 10! 75" TVs to that.

A PS4 only needs a max of 150 watts while playing. (And it’s already well powered). In comparison, a sat receiver less than 20)

No idea, I can only say how it was recommended to us. It didn’t cost significantly more either.

Yes; usually you take 2 fuses for the living room. Lights and sockets. A 3rd for the TV corner is practically already a luxury

I will now attach all sockets below behind a lowboard and route all cables via a ventilation duct/flat duct at TV height (including the power cable).

What heights would you recommend? Normally 30cm at the bottom and at the top?

We are also currently considering... We currently have 4 used sockets: TV, PS4, Hi-Fi, and LED strip. In the house, we want to have the TV on the wall alone via a swiveling wall mount, so without a TV wall. That means I would now simply need 1x LAN and 1x socket...

Don't forget the channel for the HDMI cable from below up to the TV.