Both of mine were 3-4 inches lower than the probe scares. All of the incisions were stitched except the one small one (half inch) that the drain tube exited. When the tube was removed the doctor just put surgical tape over it. All of my incisions healed quickly with not a hint of trouble.
I have a theory that if a pre-existing weakness in the abdominal wall is agrivated by the daVinci procedure; it will result in a hernia, or in my case and yours 2 hernias. I am going to read the info from the JH's site that SJC has kindly provided us.
ps. I just read the article on "Post RRP and hernias" While it did not address daVinci surgery I would guess the same risks apply. In fact the daVinci procedure involves the inflation of the abdominal cavity to increase the surgeon's visability. Maybe it is the reason that a weakness in the abdominal wall quickly becomes a hernia. It might be possible that even a small incision opening could fail, and become a hernia.