Popup to appear under each post

The need from my client is the following:
- They need to show a popup on all posts (of specific category)
- The popup once submitted (Contact Form 7) under a post it should not show again when re-visiting the same post.
- For any other post that the user visits for the first time the popup should appear.

So far the popup I created has a global behavior. Once submitted under any post it will not show again (globally)

I am not sure if there is an extension I can use or any custom code guide you can refer me to.