@Kayleigh - great thread!!! The 2 & 4 tape debate continues lol, I personally like 2 tape diapers for during the day time, I think body shape has a lot to do with them and performance, most 2 tape diapers wont go past 1500ml so for me its only a daytime diaper. what I find with two tapes is position, side folds and tape snugness.
Using a abu kiddo medium as a reference, and knowing that I'm about 6ft 1" tall with a 34" waist, trim body type with a fairly flat butt, no belly.
I like to have the top most portion of the diaper (talking about the elastic waste band) about 1.5" below my belly button, the back of the diaper, top most portion (back elastic band) is about 1" higher then the front. The tapes (since I'm taller) land on the upper most part of the taping panel, I make sure the sides of the diaper core are folded to create "pouch" or pocket so fluids can pool and travel toward the bottom rear, helps when you fold the diaper in a V long ways before wearing.
I also use this method with the bulkier 4 tape diapers, obviously I get better absorption, but wearing two tape diapers feels very comfortable and gives me less chaffing, plus the more frequent changes is healthier for my skin (1 change about every 4-6 hrs)