You can add one Facebook account to your Connectio account.
In case you want to use Connectio for multiple Facebook accounts, you will need to get access to multiple accounts of ConnectLeads (we don't have any agency package at this time).
When you are using ConnectLeads, you'll need to be set as an "admin" for every Facebook Page. As long as you are an "admin" of the page, there is no limit in how many pages you can use it for.
When you are using ConnectAudience, you can use for up to 2 Facebook Ads accounts (which should be both be attached to your Facebook account).