If I remember right, the module with the 6 presets if not specifically for the SRG series, but the EVI series.
You can find it it in the market place.
Protocol should be identical.
Whar are the responses from the camera when sending a camera preset save/recall command?
Anoher thing comes into my mind: Afaik the IP control requires address parameter in the command to be 1.
Different addresses do not make sense, since the cameras are addressed via IP address, no daisy chaining over IP. Please check the protocol documentation for more info.
Best regards
Crestronfreak55