The only good thing I can see about having a double hernia surgery is that from what I've heard, once you've had a hernia in one place, you can never have it in that place again.
I've also heard that they are more common in people who were quite overweight and then started to lose weight. I guess because the tissue in that area becomes thinner and more stressed.
I guess the risk of that gets lower if you make sure to do crunches and things to build up your stomach area, but I'm not sure.
Of course, the other thing you should do to avoid getting hernias is to make sure you bend at the knees when you are picking up something heavy!