How many authenticated visitors are allowed in Suite Growth and professional(not asking aboutagent)

We have our FAQs/Help page for our website that we would like to move to Zendesk. And only our platfrom users should be able to access our Help/FAQ pages. There is a Redirect from our website that should happen to Zendesk for that. Does Suite Growth and Professional takes care of that and is the cost impacted by how many visitors/users are viewing our Help/FAQ pages?