I don’t know, put the Hunter Ring on the Hireling and let us know if it works. from what I understand, only the Dealer Perk works on the Hireling, and it doesnt’ stack with Main with Dealer Perk. having 2 Hunter Rings shouldn’t stack, as Having a Hunter Ring and Hunter Perk doesn’t stack.
@Mr_Scooty wrote this before Patch 3.0, and later in the Thread he gives an update after making some changes after Patch 3.0 came out, after using it to farm for Eternal Pets.