Examples for MIR 3D routing in 3D in several popular DAWs here:
-> https://www.vsl.info/en/tutorials/guides/mir-pro-3d-exploration-pack
Surround- and 3D capabilities of Vienna Suite Pro are totally dependant on your host. In Nuendo/Cubase and ProTools it's sufficient to open an instance in a track with the desired channel-count. (... see first screen-shot below).
Synchron-ized libraries are stereo only, much like the Vienna Instruments libraries they are derived from. They are meant to be used with MIR 3D for surround- and 3D-formats, bypassing the internal positioning and reverberation tools of the Synchron Player.
Synchron Library specifics are not my forte, but the way _I_ do 3D routing for Synchron Instruments is shown in the second screen-shot for a 5.1.4 setup: I actually use direct outs (just have to make sure to activate enough stereo outputs) and use the hosts panning capabilities for the actual 3D routing. ... this might not be the official way, though. 😊
HTH,
/Dietz - Vienna Symphonic Library