Hello, unfortunately I have not installed it in the H7 Flow RGB either. My case is TG5 Pro RGB. I can recommend it.

Sharkoon TG5 Pro RGB (mATX, Mini ITX, ATX)

Happy New Year
Greetings

Hey, I didn't build it into the H7 but I also needed a lot of fans, but the pins on the morherboard aren't big enough for more fans