In order to make Premium topos, you'll need to have a "team" on 27 Crags. The team can be just you, or it can include dozens of people.
All the team members will have the right to add, edit and delete information of the crags which are under the team's maintainership. So it's good to have only those people in the team who are ready to contribute to the topos.
All team members will always use their own topos for free, even without having a Premium subscription.