This was previously answered by Beesum who said Tier 3 here will always match the Business Plus plan on the website and will continue to receive all matching updates. They’re planning to overhaul the website plans to line up with the deal (apologies for the current mismatch). Additional CNAMEs are possible — contact support@flipbooklets.com to be notified once there’s a concrete plan. You can find that answer here: https://appsumo.com/products/flipbooklets/questions/hello-flipbooklets-team-i-have-been-lo-858743/