We don’t currently have enterprise plans, but we do have two plans for teams that want to collaborate in Gamma: Teams and Business.
Our security policies around customer data and training are outlined here (but, in short, Gamma never trains AI models on Teams and Business plans!). Our Business plan offers SSO and more credits per user.
The best way to run a POC for collaboration use-cases in Gamma is to start on our Teams plan which they can sign up for here. Let me know if you have more questions!