As you have already managed books with calibre for a Sony device, I'm assuming out-of-the-box means after configuring metadata management and "send to device" driver. It it's so, Kobo works "out-of-the-box". You can sideload books as you like, and it supports ADE authorization, so no walled garden there. There're more options if you like, but that's the way always with calibre.
No advice for tablet, however, as I've set up as I pleased after playing with it, so no advice for no tech-savvies.
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