The one thing to know about Webflow
Embed elements do not render on the Designer canvas — only in Preview and on the published site. Every Webflow user hits this once and assumes the widget is broken.
Where reviews belong in a Webflow site
An Embed element in any section, or Project Settings → Custom Code before the closing body tag for a floating badge.
Full-width sections suit carousel and grid layouts; sidebars and narrow columns suit a badge. Floating badges can be restricted to particular pages and to desktop or mobile.
Reviews and search results
The widget outputs review schema markup automatically. Whether Google shows a star rating depends on what the reviews are attached to — worth reading before you expect stars, because for a business reviewing itself the answer is usually no.
What does help either way: reviews on the page are content, and a page that answers what customers actually say is a page people stay on.