In my configuration I have the white switch (Inteno XG6846 Gateway) handling the edge routing (QoS, VLAN splitting). It has 3 connections, IPTV, VOIP and Internet coming out, with the GS105Ev2 splitting the IPTVs to the rooms with dedicated CAT6e cables.
The internet cable from the gateway goes to the S1300 for Firewall, DHCP, Adguard, VPN, WIFI and any other services.
The from the S1300 I then extend all the LAN ports via the first GS108Ev3, and the string continues to the other rooms via the red plug to the next GS108Ev3 in the other room, again via it’s own CAT6e cable.
Why the different lines? Well cos of the different VLAN levels, I want to keep them separated in case just the internet goes down, TV’s still work, as they are on the ISP internal network only anyway, so they don’t need any protections. It then also lets me tinker with the S1300 and not have other things affected.
I like my setup, and I will replace the S1300 soon with a Velica as soon as I can get one, to do some Meshing to the other rooms as well. Maybe you want a similar setup. The Switches connected to the Brume for example, with Brume basically handling everything going out to the net.