Yes, you can read your books on as many hardware Kindle and Kindle for (platform) apps as the publisher will allow (the default is 6; some allow more or fewer).
They do have to be registered to the same account for the initial download, in order to get a file that's properly encoded to work on whatever you're reading with. And I think that Kindle for PC/Mac have to stay registered to the original account, since they check online every time you open them up.
But after that, on a hardware Kindle at least, you can switch the registration to something else and still continue to read the books from the first account.
This is how multi-Kindle households with separate accounts so that partners/spouses/parents can keep their purchases separate and maybe have a special kid-friendly "family" account to boot are able to share their books between themselves.
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