You can display your Google and Yelp reviews by adding a Wix App to your site. See the app on the Wix Market
Wix Control panel for ease of configuration
You can add your Google and Yelp places straight from the control panel.
Fully customisable design
You can change almost any aspects of MyReviews to fit your site look and fill including backgrounds, border, colours and logo styles.
Show all the reviews or just a summary
You can just display the summary of your reviews or enable the display of the full reviews.