The WP Customer Testimonials plugin has the ability to add rich snippets markup on the front page of your WordPress site, home page, and also on the post/page your placed the shortcode in, and try to validate rating in Google Rich Snippets Tool.
The plugin calculate rating data based on your customers’ rating which saved as a custom post type
Also, we added some extra functionality to make it easy for you.
The screenshot below gives you a hint on how the settings page looks like.
* We recommend you always display real data on your reviews, and include rich snippets on post/page where the Testimonials shortcode has been used.