I also recommend All in One SEO rather than YOAST as it includes TITLE, DESCRIPTION and KEYWORD fields for products. Yoast only does that with a paid add-on. Also, it handles your site map, robots.txt, htaccess file, blocks bad bots and adds Open Graph data for Facebook and Twitter. It's Yoast's number one competitor ... and in my opinion, far superior for an e-commerce site. Yoast is mainly for blog type sites.
I've just learned of SEOPress having seen WPCrafter's review on YouTube. Simple and elegant with a $39 pro version for unlimited sites. Worth a look.