The fan blade design is a hybrid between airflow & static pressure, so they should work fine as either case fans or radiator fans. At high RPM they’re relatively loud (as is most fans). They still move a good amount of air at low RPM & with 6 fans I sure hope you’re not running them all at 100% anyway. Pros: Great airflow & acoustics
https://www.amazon.com/upHere-Intelligent-Addressable-Motherboard-Adjustable/dp/B07HK7YRCD