How do you connect noctua fans to atmos stealth?

Hey, so I’m doing a formdt1 build and, like everyone, I decided to go with an atmos stealth and replace the fans with two noctua fans. However, I’ve noticed that the coolers fan already come with a fan splitter, and the noctua’s do not. Do you all use a fan splitter to the motherboard? Or do you connect one fan to the cooler fan header and another to another header and simply change the fan curves? Thank you!