We have an account with elfsight.com; they produce a google reviews widget - search 1Password for the logins.

Ignore the advice on the elfsight website about installation, just put the js and the html inside a container in YooThemePro and the reviews widget will appear where you want it too.  

You will need to turn off the script stripping in JCE - see this link Turn off js script stripping

Example on Elite Driving