Shopify Online Store 2.0 doesn't happen to require any code placement. The Options can easily be enabled right from the theme customization in the Shopify Theme.
1. First of all, go to the Online store >>Theme from the side menu
2. Now click on the Customize
3. Now you get the Theme customizer
4. Now click on the Theme Settings, and click on the App Embeds
5. Now check the app and click on the Save button
Now the app will work as expected in your store