The Netduma R3 is connected directly to the Opticomm/NBN connection box (no modem/router in between).
The previous TP-Link router has been removed from the upstream connection. The R3 is now the primary router receiving a public WAN IP (125.x.x.x), so it is not behind CGNAT anymore and not in a DMZ.
The PS5 is the platform I’m playing on, and it is connected via Ethernet through a wall port. The wall ports are fed from the R3 LAN ports via the home patch panel.
Geo-Filter has been disabled during testing, and UPnP is enabled on the R3.