App Pricing with Different Plans

I have a Premium app with 6 or so users. I’ve built a second app, in which it will need to be Pro based on some workflows. I thought I understood that the 6 user would be $5/mo, and the users using the Pro app would be $10/mo each. I’m being prompted when I upgrade the plan that I will be charged $70/mo…
I should be charged:
6 x $5 = $30
1 x $10
Total $40

Am I looking at this correctly?

Hello Joe, your AppSheet account is governed by one subscription (i.e. it is not possible to have some users on Premium, and some users on Pro subscription under one account). In this situation, once any Pro feature is enabled within any of the deployed apps, all users will need to be counted as Pro users.

To avoid this overcharge, you can set up two separate AppSheet accounts - each for one fo the subscriptions. Keep in mind, the apps under those accounts will be hosted separately.