I bought these with Presonus Eris E7 XT and they fit quite nicely. I might end up trimming away the excess in front of the speaker.
When I did A/B with and without these I concluded that they help keep the bass more clear and prevent all the tiny stuff that I shouldn't have on my table from rattling when using louder volumes.
NOTE! Cat owners beware, they collect fur like a nightmare and aren't that fun to clean, especially when your cat decides it's a better pillow than a monitor decoupler. This is why i reduced one point. Seriously consider using rubber feet instead, I know I will.