Beginner Question

I am new to aneros and was looking for some help. I bought an Aneros Helix Syn about a week ago. I have been reading this website, the actual aneros page, etc. I have been working on the pc and anal contractions. However, is there a certain length the aneros should be in? Mine goes in all the way no problem. However, it feels like the top part is hitting my bladder more than the prostate. Is that normal? Should I only have it halfway in?

FYI, I have played with my prostate prior to buying an aneros so I know the sensation.

Thanks for the help.