Kobos aren't rooted, because their OS is open already.
As to modding, I patch my Kobos, but I don't have NickelMenu installed. I sideload everything from my laptop via Calibre, because Calibre automatically manages the metadata on the device. I do have Dropbox on my Sage, but I seldom use it and haven't bothered to install it on my Libra 2.
If you don't use Calibre, then installing NickelMenu and Dropbox seems like a good option.
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