Planning electrical systems to be future-proof

To be able to use VLANs etc., you also need a Unify router or Dreammachine... As I said, I would stay within that system.

Do you see any other advantages compared to a switch from another manufacturer?

You could take a closer look at the (idle) power consumption if you want to optimize operating costs.

You should not underestimate the running costs. 100 watts continuous operation (you reach that faster than you think) amounts to 876 kWh over the course of a year. Without end devices.

I would like to speak up again. Meanwhile, our four U6 Pro are hanging from the ceiling. I spent a bit more money on the switch and chose the Ubiquiti 24 PoE. When everything is finished, I will gladly write a final post. :) Until then, I have one question: Today I noticed that the Keystones from Metz Connect are used for the installation cables 6a. My explicit wish was to use Cat 7. That is installed everywhere. Are the 6a Keystones okay or should I have that improved?

You want RJ45 sockets, right? They don’t exist in Cat.7

P.S.: The 6a keystones can

You want RJ45 sockets, right? They are not available in Cat.7

Oh. I'll file it under the motto: Better embarrassed here than at the electrician. :)