A: Thanks for asking.
You can add it with GTM. If you don't have a GTM on your website, you can add it following next steps
https://support.thrivecart.com/help/tracking-with-google-analytics-using-google-tag-manager-gtm/#:~:text=Go%20to%20the%20'Admin'%20tab,to%20'Get%20container%20file'.

And after add RushWidget code following this instruction
https://www.rushwidget.com/post/how-to-add-the-all-in-one-%D1%81hat-widget-on-a-website-using-google-tag-manager

Thanks!