Installation for a set of subdomains

I run half a dozen pro bono sites off my server, each in its own subdomain. Do I have to install Matomo separately on each one, or can I install it once on www and have pages from all my other subdomains use it?

You can use per domain/subdomain a separate tracking ID. Look in the admin page under websitesmanage. Or you can use one ID for all and use this _paq.push(["setDocumentTitle", document.domain + "/" + document.title]); in your tracking code to display the domain/subdomain-name in the statistics. Default there are hidden.
More infos:
https://developer.matomo.org/guides/tracking-javascript-guide#custom-page-title

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OK, thanks very much.