Mounting a ski 1 or 2 cm back from center isn't going to stop any tip dive in pow. Just one or two cm really won't affect all mountain performance, either, so I'd reccommend just going with the center mount, it'll be rad and you won't regret it.
If you do want to mount it one or two back though, go ahead, it won't affect turning or anything based on the radius. Like said above, I've mounted a lot my skis like 6 to 7 cm in front of the mount point, so it's definitely all good whatever you do.