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Like Bernadette already mentioned, it's very important as well for a dynamic site to have a sitemap. It will make sure that the pages that are new are submitted to Google faster then them finding out by themselves what kind of pages are new.

What exactly are you planning to render server-side? In principle, you shouldn't have anything to worry about if you render everything server-side, provided the rendering isn't so slow that it affects Google's measures of page speed. What do you see when you use the 'Fetch and Render' feature in Search Console at present?