Hi Dj_scratch_3,

Yes, you can use Video-SL with any mixer as it is software driven it can also be mapped to the Rane Sixty Eight, TTM 57SL and a number of Midi Devices.
Video-SL's Mix Output can be sent to your Secondary Display this will be scaled by your laptop video cards resolution and memory allocation.
Once you have purchased and authorized your Video-SL Plugin in the Scratch Live Set Up screen select the Video-SL Plugin and your ready to go.
You can read the Video-SL checklist here: sera.to
There are a number of informative videos introducing the features and getting started with Video-SL
here: sera.to

Let me know if you have any further questions.