It is mainly self preference when you make the rows of holes. This is what I do.
Slightly big holes of the other rim (not too big)
On the phunnel make a row of small ones, a row of another small ones around the center holes, and then an actually hole in the phunnel holes. This middle hole isn't really needed too much, it is just needed for tnagiers and for the foil not to get sucked down. It won't if the foil is tight enough
Hehe lil ghetto demonstration: