You can use ConnectVideo for all your Facebook pages (and/or all Instagram™ business accounts) that you’re an admin of.
However, it's currently NOT optimized for "agency usage", so we don't have sub-accounts, and we only allow up to 3 ad accounts.
So although the number of pages you can manage is unlimited, the number of ad accounts would be the limiting factor if you'd like to use it for clients.
As always please feel free to reach out to your support heroes at [email protected] if you have more questions, we got you covered.