For ebook hosting with reading progress, I have had good luck with Kavita. It has a web reader that syncs across devices and lets you set up separate user accounts with individual progress tracking.

One thing to watch: metadata sources. Some servers scrape Goodreads or LibraryThing automatically, which can cause version drift if your library grows large. I personally prefer manual metadata entry or importing from Calibre — keeps everything consistent.

Also happy to share a simple metadata sync script if anyone wants it.