Multi user virtual reality sessions

Hi Everyone

I have a HTC Vive set up which i use IRISVR - Prospect Pro to do virtual walk through of retail stores i design.

I am trying to work out how i can create a multi user experience (5 ppl) all at the same time with everyone in the same room.

Prospect can allow 12 people in their multi user experience, however all 12 would require their own computer / headsets + internet connection. This is fantastic for people in completely different locations.

Does anyone know of a simpler way to create a multi-user virtual classroom where 4 or 5 people are literally standing side by side viewing the same file at the same time.

Thanks in advance