This is kind of complicated.
As I understood it (but not verified) is the new Slink Port a auto adapting port, wich switches between different Protocolls.
The Old Protokol wich was used by GLD & QU are not TCP/IP Based. They are not possible to route over an switch, because of the missiong layers (layer 3 or 4) wich are necesarry for the routing within the Switch.
I think the newer protocolls of SQ and Avantis behaving the same, cause they are mainly made for simple point to point connections.
BUT:
The Avantis also supports the newer Protocolls of all the D-Live Stageboxes, the DX Boxes. And as I understood it, here is a Protocol used, wich ist based on TCP/IP. And the GX4816 is also capable to be used by this protocol.
But I’m not shure, how it would behave. There is a small chance, that it works. Please stand me corrected if not.
Savest Way is a direct connection, without the router. If you have a propper Houseinstallation, you should be able to just make a direkt connection on the patchfields.
The other possibility is Dante, and using a Dante Box or other Dante Hardware. Dante is a TCP/IP Protocol and qorks quit well.
Kind regards