You have that nice railing....!
Umm, ok. I wouldn't exactly call it nice. I don't think that railing has been changed since the place was built in the early 70s.

and put some bolts through a hole in the railing
I don't know where you condo is, but I would like to move there. I have a non penetrating mount because altering anything on that deck is against the rules. The only things you are allowed to fasten to the deck are hooks for hanging plants and flag holders.

You are also nlot allow to have anything hanging over your air space. Once the flag-displaying holiday is over, you must take your flag down. So, even if i were allowed to make a hole in the railing, the dish would likely be just outside my airspace. Damn these cuffs are tight.