if you go to local opel service they do full camber and general suspension setup
plobely cheaper then come to uk 
I dont know how good dealers are in your area, but here they have become a bit of a joke. Maybe part of the problem is that the omega is no longer in production and the mechanics trained on them have left, retired, forgotten, or just dont care about the omega generally. Whatever the reason, probably extreme financial pressure, nobody on this forum has anything good to say about dealers as a general rule, and is partly why this forum is so popular.
I can only advise with this in mind, and that is,
check all your suspension parts for general wear and tear before you get the car geometry set up, any later replacement parts can easily change the set up you have just paid for, making it a waist of time and money.
Specifically check,
1. all 4 wishbone bushes for play, controlled movement of the rubber bush is ok, but slop and tears within the rubber means replacement.
2 stearing idler for play.
3 broken springs, usually an inch or 2 broken off either end and very hard to find.
Any leaking or worn shocks or track rod ends should be replaced. Then as said, find a geometry set up company using lazer alignment for total accuracy and an operator who is equaly fussy.
The standard factory settings are so wide as to be practically useless, even "in spec." settings can rip tires up. Personally i have spoken to dealers claiming full set up, trust me, in the uk, they have no idea. Avoid!
Hope helps.