I just had surgery 6 weeks ago at Mayo's for a parastomal hernia as well as a midline one - so 2 at once. It had to be open and I had a 10" incision. I had previous hernia surgery by a local surgeon in the midline area and there was existing mesh she had to contend with so maybe that is why it couldn't be done laproscopic.
She performed lapro surgery when diverting from using my j-pouch to a permanent ileostomy 4 years ago. 6 months later she removed my j-pouch and that had to be open. I don't know if I can help you but if you have any questions please ask.