We have one Matomo instance per shared server and all the users accounts on the shared server get Matomo accounts and all the Apache VirtualHosts get added as sites, the (rather large) role adding the users account is here:
See the Matomo tasks:
This is a repo that pulls all the roles together:
The intention with the Matomo role is for it to be usable without all the other roles, it depends a lot on these two plugins:
The Matomo role can also be used to upgrade Matomo servers, which is handy when you have a lot of them 
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We should probably split the Matomo posts off this thread?