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It shouldn't matter if it's all combined into one section or not. For featured snippets, the most important element is to make sure that it's clear what question is being answered and that the answer is laid out in an easily quotable format. Reiterating the question within the answer, for example, would make for a more quotable snippet than just an isolated answer.

I work with a client who is about to launch a local landing page for one of their locations. They're worried that the new local landing page will cannibalize some of the keyword rankings for the homepage. Any advice on how to have a local presence but still drive people to the more valuable homepage?