I would strongly recommend that you don't by a 6" e-ink ereader to read PDFs. None of them do a great job. PDFs are generally sized for large page sizes and you will need to zoom and pan and that doesn't work well. The Kobo displays the page well, but the navigation is terrible unless you don't need to zoom. Kindles are supposed to be better, but I don't use them.
You can use inverted mode on the Kobo devices. It is in the firmware, but, isn't offically supported. Plus there are some other ways to do it.
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