If it is worth something, currently I'm using FBreader (from fbreader.org -I think there are some other versions). No in a Pocketbook.
I said, I'm using FBReader in: iPhone, iPad, Note 9, Galaxy Tab 3 (the new one), iMac, and Boox POKE PRO (with Android). It more or less syncs positions well (fails a lot in Boox) and syncs notes across all devices (well, macOS version does not have support for that). It syncs books as well.
Other alternative is Google Play Books, that if it is not available in a device, you can use in the navigator and syncs everything. However, I've not tested the browser version inside a ebook (I assume it won't work).
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