How to secure parse server's _Installation, _Session and _Role classes?

Question

I am building a mobile app and I use parse server as back end. I use cloud code for accessing parse database. Nobody needs to direct access to database. All data related operation done by cloud code api access. I deleted all custom classes' CLP permissions for all users and set correct permissions (Get and Create permissions granted, rest of them revoked) for _User class as documented. But I can't find any documentation about _Installation, _Session and _Role system created classes. How should I set CLP permissions for _Installation, _Session and _Role classes to secure the app and whole system. Thanks