The one thing to know about Webnode
Custom HTML availability depends on the Webnode plan and editor. The widget itself needs no plugin, but the site must allow the HTML embed element.
Where reviews belong on a Webnode site
A dedicated content row gives a carousel or grid enough width. Compact badges also work beside contact details or near a call to action.
Full-width sections suit carousel and grid layouts; narrow areas suit a badge.
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.