If your lowering your car no matter what you do the camber specs are going to change.
I had my e30 lowered for a while and actually bought camber plates but never put them in. I changed back to stock anyway but you can always buy front camber plates and get a race shop to do an alignment for you. I doubt you dealer will with camber plates but who knows. For you rear camber you can adjust it with the lower control arm. Adjust it to specs, questionable but you can do better then it is.