Gallery would be a better choice for a pre-em on centipede. It is a liquid based product but less detrimental on the stolon and root growth. Are you familiar with how a pre-em works? Also, buying from John Deere to my knowledge does not require an account unless you are a pro--then they offer some discounts.
Good luck on the turf. Wait until after you've mowed it two/three times before applying your fertilize. Read up on fertilizing centipede turf through the search button.
We all are merely gleaners from the masters who were here before us.