I'm a retired guy who just loves this stuff........ I'm going to give you an answer before some of the "professional " guys answer cause I want to see if I am even close Please don't do anything untill THEY answer.
Golly, I hope nobody gets really mad at me .
OK, if the flange is even with the top of the tile, I would say that you need to use both. Or just two of the "regular wax rings". I don't think there is anything "magical" about the plastic funnel.
I'm thinking about going to the local Vo-Tech and taking a night class in plumbing.......... Ain't I crazy ? Tom