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Been enjoying using my Boox Nova Air that connects to my Kavita through Moon Reader+. I just download my epub or PDF to read. That flow has been working like a charm to me.
Keep in mind that it's an e-reader, so it's black and white only. May be fine with you or you may want an iPad or an Android tablet for color and speed
EDIT
Have read also from my Kindle and Kobo library as it is an Android device and have both apps downloaded
I have a Kobo Forma and a Boox Lumi.
The Lumi is huge and works well for manga, especially considering the sad state of legally obtainable manga in the United States where everything requires proprietary Android apps, or if you want to do workbooks or something using the stylus. It's surprisingly good, even for things you wouldn't normally do an an ebook device. I've never used any of the smaller Boox devices so I can't say whether it's the same for all of them.
The Forma is a normal size so it's much more portable.
Both of them have wifi and you can run your own software on them, but I think running your own software on Kobo devices is less well supported than running your own software on Boox devices.