I have a motorbike and spent an entire night combing everywhere in Poipet.
These are the locations of clusters of brothels. They have a massage sign with a photo of a massage outside, but not always. I was quoted $8 by a SYT for FS and $50 for overnight in 2020.
The point circled in red is where the SW hang out. $30 for overnight as of 2020.
I rode everywhere, including along the shantytowns along the border and along the south of the railroad. I was unable to find any "chicken farms" and tuk tuk drivers didn't know what I was referring to when I asked them where the "chicken farm" / កសិដ្ឋានចិញ្ចឹមមាន់ was.