I wasn't given a choice either. When I met with the surgeon, he showed me where he was going to place it and I wasn't offered a choice. Mine is level with my navel, about 3-4 inches to the left. I'm glad mine is above my belt line. I have to sleep on my right side or I get alarms all night long. I was told that generally, people sleep on the opposite side from where the cath is placed. Obviously, that's a case by case basis, being everyone is different, but that seems to be the 'guideline' that was told to me.
Something I just learned while getting training for PD (my cath surgery was 3 weeks ago)...the doctor controls what DIRECTION the cath will lay also. Something called a "tunnel" and my PD nurse kept feeling horizontally across from the belly-button to the exit site. But mine was looped upward and comes down vertically from the top. I think that's good because the tubing lies flat naturally when pointing downward. Seems it might be more awkward if the "lie" of the tubing was out toward my left side. But the PD nurse seemed to think mine was unusual. And I have no idea if this is something the surgeon decides once he gets inside the abdomen or not.
Could you explain in more detail what a double cuff is?