Not sure if I’m stimulating prostate

I’ve been using the aneros for a few years on and off. I’ve committed to being a bit more consistent with it now that I have more free time. I’ve done two hour long sessions and have been using the breathing techniques and I don’t really feel like I’m hitting my prostate. I kind of feel like I’m just hitting my rectum wall. What I’ve been imagining is that the helix is like a hammer, when I contract it is brought up and when i relax it comes down onto the prostate.

I’m guessing the solution is just to keep at it but I’m not really sure if I’m doing it right. One thing I noticed is that the p tab isn’t even touching the perineum and the back tab is actually pressed into my tail bone.

Any suggestions on positions/ techniques/ feeling I should be looking for to hit the prostate?

Sorry for stream of consciousness