Tweeter position on front baffle

I am planning to build a pair of 2 way bookshelf speakers. I have seen in some speakers that the tweeter is not aligned with the center of the front baffle. I understand that this is supposed to help with diffraction. Is positioning the tweeter closer to one side a straight forward benefit (while keeping it as close to the midwoofer as possible), or does it require other considerations to be worth it?