A quick update to this. If developing your “own” Cinema Vision into Plex, I just found out that PreShow Experience is the successor to CinemaVision. I implore you to work with them. Please. It will be an incredible implementation.
Here is their website: https://preshowexperience.com/
It looks like they have just started up as of a few days ago so they’re still in the process of getting everything up and ready, but this may be a great time to work with them so they can make it an easy implementation.