I have my Calibre library in Dropbox and am using it on 3 laptops. Yes, you can only have 1 instance running at the same time. Moreover, pause syncing while Calibre is open. Always sync BEFORE opening Calibre and AFTER closing it. Ditto for your other computer. And even taking those precautions conflicted copies still happen. Which means you have to run the library maintenance regularly.
For me, the setup is worth the bother. But I'm certainly in a tiny minority with this.
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