Hi welcome to the forum.
The poles in strat pickups are non-adjustable. I understand that it is "possible" to press them through, but you are likely to break the coil because it is wound directly on the magnets.
Like 38th, I've also heard that it doesn't make much of a difference, but I have no practical experience of this.
I use staggered poles on vintage profile necks, always have done. In fact "flat" strat pups look slightly odd to me. I'm not sure what I'd do on a non-vintage profile neck, but I'm unlikely to have to decide, because I don't seem to like flat fingerboards on a strat, just doesn't feel right to me (LPs, SGs, flat as poss please, but on a strat I want that camber...)
I don't think I've helped you much though... :roll: