Hello, out of uncertainty I bought the Deco Mesh System S1900 and the Archer C88. I currently have a FritzBox 7590 in the house (3 floors), i.e. main router/modem. A switch is then connected from which I then go to the respective rooms via LAN. So far I have used the FritzBox and an Archer C6 for WLAN coverage. But now I want to have mesh. According to the Deco instructions, you cannot set up the units in parallel behind a switch, which is why the system is not an option for me. The Archer c88 supports EasyMesh. So now the questions:

1. Can you connect additional access points to the network via LAN and integrate them as a WLAN mesh? or is this only possible via WLAN <> WLAN?

2. Is it possible to set up the Deco units in parallel behind my switch?

Thx