Calibre does manage multiple devices, except sync, which I don't care about.
Quote:
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It supports popular formats like PDF and EPUB, and once the books are uploaded, the app organizes them, making it easy to find and enjoy them from any device, anywhere, as long as you have a browser.
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So like Calibre it makes a copy in its own file system.
Calibre Content server does the web bit. Also supports OPDS.
I'm sceptical it will be as good or as easy to use as Calibre. If it's easier, then it probably does little.
Calibre even works well now on ChromeBook's Crostini, which is Debian 12 in a container. Amazingly for Google it's not Beta now! Admittedly you have to use Connect to Folder as a Device with USB mass Storage, though my phone running USB MTP briefly connected direct.