Blackhawk owner here: On mine, it did make a noise difference. About where the limb thickens seemed to be best.
On my Victory, about 3" from the limb pocket seemed to be best-
I did read where three bows from the same assembly line will have different noise levels, so experiment- on the black hawk I slid the VB's down to the riser, and added limbsavers- pretty subjective, "seemed" quieter...but "seemed" is what sells a million dollars of archery stuff a year LOL