You can do either. That bait does have an awesome action, much like the slammer. Besides the added squeak and better action, I feel the knot cinches better and is stronger on a thinner material such as the snap swivel rather than the thick eye screw. That's just from my experience, do whatever works best for you. I think this falls under the "scent category" which states, hey, can't hurt so why not...
-Brian