All current eInk Kindles support RTL text in AZW3 files, however, the Arabic glyphs from the default font, code2000, are rather ugly and code2000 doesn't handle diacritics and Eastern Arabic numerals well.
I.e., if you're a typophile or you're mainly reading Arabic books with lots of diacritics in them, you might want to consider a different model, because all current models with a 5.6.x firmware (Basic Kindle, PW2 and Voyage) can't be jailbroken and you can't embed Arabic fonts in AZW3 files.
However, if you find a cheap refurbished PW1 (or a PW2 with a 5.4.x firmware) online, you could jailbreak it and install a code2000 override font, e.g. Arial.
As for Kobo readers, AFAIK, only some models have RTL support. You may want to ask in the Kobo forum about it. You can post the epub file that I attached and ask them to post a screen capture or let you know whether the text looks like the text in arabic_epub3_Arial.png. (The epub might need to be converted to a Kobo kepub first.)
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