It's not possible to install the preview badge on the collection pages and home page using app blocks yet. It can still be done using liquid.
- In your Shopify admin, go to Online Store > Themes > Customize.
- Click Theme settings on the bottom left and choose App embeds. Make sure our core snippet is enabled.
- Choose your product template at the top.
- On the left-side menu, click Add section and choose Preview badge under APPS.
- Then you can change the position of the preview badge by dragging it up or down.
You can customize more settings of the Preview Badge in Judge.me, check this article to learn more.