Implement LAN and SAT in a single-family house with a central server cabinet

Siedle has a VIOP adapter. Just google Doorcom. There is also a manual for the Fritzbox.

The gray ones are patch panels. In your place, don't take a 24-port one right away for mounting in the rack. The white box is a NAS (2-bay Synology?). Structurally, I only see a Fritzbox as a router and an access point since there is only one injector. What I see should be fanless except for the NAS. If installed in a cabinet, it is not audible. I'm currently tinkering with our network for the new house. Currently setting up like this:

For God's sake

The small black one is a POE injector from Unifi.

Doesn't the injector have to be "on site," that is, where the socket in the wall ends at the destination? Or can I use such an injector from a central location to equip any ports with PoE?

Siedle has a VIOP adapter. Just google Doorcom. There is also a guide with the Fritzbox.

I actually already found Doorcom. Apparently, there are different versions like IP 1+n or something... But honestly, that's where I draw the line. Then it starts with wiring the door for the door opener, etc. I can somewhat manage with the network, but as soon as it goes toward Doorcom in the control cabinet, I think I'm done...

If the switch does not support POE passthrough, the injector must be placed behind the switch. Depending on the type of POE and cable, the distance can be up to 100 meters. So normally not an issue in a single-family house. You could therefore install the injectors in the rack. A modern access point (NanoHD) typically consumes less than 5 watts.
A hotspot is not enough for a single-family house if you want fast WiFi everywhere.
However, you have planned several outlets so that you can easily expand.

All correctly seen by rick2018.

Definitely use a proper 19" patch panel. I just started with the 2 grey parts and left it like that for now. The patch cables to the switch are actually too long for me, but you just use the things lying around.

Currently, only one access point (UniFi Accesspoint AC lite) is running. It's enough for one floor in my case. The WLAN at the FB is turned off.

The NAS has a small fan on the back, but very quiet. You hear the hard drives more.

The POE injector is directly between the switch and the respective port on the patch panel. Normally, every network connection can be made POE-capable. The device at the end must also be POE-capable.

Thank you for the information so far...

I will revise my plan accordingly and post it again.
Possibly with the components I have in mind for it...