Update:
I have since tried it and it sort of works.
You are able to send audio to Waves Superrack from your Qu Mixing desk just like you would send it to a DAW. The problem is routing the audio back into the desk.
Qu Mixingdesks neither have an insert point that you could use to rout audio back and forth, nor can you use the preamp while then processing the audio coming back from USB (like you would use Waves with an X32 for example).
The only solution I have found sadly is using the input on one channel and routing the processed waves audio back to a second channel. You therefore can only use half the channels on your desk if you want to rout all of them through Waves.
If anyone finds a work around to this problem feel free to share 😀