Cable Matters 2-Pack 3 Way 4 Pin PWM Fan Splitter Cable - 12 Inches / 30cm, 1x PWM-Controlled with 2 Follower, PC Fan Splitter 1 to 3 Converter

Daisy chain or use a splitter like this: https://www.amazon.com/Cable-Matters-2-Pack-Way-Splitter/dp/B07PXLHNZ6 I'm using a splitter i had lying around.

Wait so if I use this thing https://www.amazon.com/dp/B07PXLHNZ6, it won't let me configure the second fan hub? If not, could you please elaborate further?

Make sure your double fan header is has 4 pins and not just 3. For example, I've used these before, https://www.amazon.com/dp/B07PXLHNZ6, which are triple fan splitters. Only one of them has a 4 pin connector. The end that plugs in to the motherboard has 4 pins also.