That spec range is the same I have gotten from the dealer and Firestone. The insides are going to wear quicker because of the camber. How bad depends on how aggresive the camber is. After dropping on eibachs I was at -2 on the driver side even with the MB adjustment bolts.

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I had to go with the K-MAC front kit to get back into spec.

If you are not lowered the Mercedes bolts will allow you a bit of adjustment .3 in my case. They only have two ways they can go in. One way for positive, one for negative. The rear camber can not be adjusted stock. I have MikeR camber bars in back but you can make your own as well. K-Mac has a rear kit as well but the adjustment isn't as much as the bars.

If you go to a shop you can tell them where you want it adjusted to, most will just leave it at any number in the acceptable range if you don't specify. Anything less than -1.0 should result in more even wear but at the cost of handling. I am at .9 in the rear, can't remember the front.