What kind of products you want the product placement for?
I also have an onlyfans where I have shot with several models.
What I can do is upload teasers of videos and they would get 20k-100k views each and add a sponsored by: at the start of the video and end.
However, I can't upload on Pornhub as they admit only either sites that pay them as affiliates or models who star in their videos.
this is a sample trailer
https://xhamster.com/videos/first-ev...a-man-12904734