One question I have a WLAN amplifier in my room and only have a LAN cable connection for my amplifier but need 2. Are there splitters or something like that that connects to the amplifier and I can connect it to a PC and PS4.
Yes, there are such devices called lan splitters, I personally use a large server switch with 32 ports, but the link switch sound here https://www.amazon.de/...00A128S24/ also does it for you
The part costs 16 euro and is very good. You then have to plug the LAN cable from the amplifier into the first port, and the others into the 2nd and 3rd port.
And how do you close the LG
The cable from the amplifier into the first lan port, and then the cable from the playstation into the second and from the computer into the third.