Optimal arrangement for habitable zones?

So, here's my issue. My setting's central conceit is that a myriad of human societies developed at relatively concurrent times across a large system separated by only a few light-hours. (There are, of course, a few tech gaps.) However, as these societies are all inhabited by pretty biologically similar humanoids, I'm looking to maximize the number of habitable planets I can create within the setting without straining my Hard Science Credibility (TM).

Should I run with a binary system? Trinary? Use a bunch of moons of otherwise inhabited planets? I appreciate any and all feedback.

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Optimal arrangement for habitable zones?

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