Use the blog for the series, and since you’re already comfortable customising Pipeline, create an alternate article template (e.g. article.guide) that adds a Melia product callout section below or beside the content. That gives you the structure and SEO benefits of a blog with a bit of the design flexibility of a page, and every post gets a built-in route to the product. If one piece ends up as a cornerstone guide, you can always build it as a page later and link the blog posts into it.
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How to Find the Right Size Ironing Board Cover
Ironing boards come in more shapes and sizes than you’d expect. Here's a two-minute guide to measuring yours and finding a cover that actually fits.