This picture is for reference only and doesn't quite illustrate case B) because in that case, there would be no PSU shroud.
Has anyone done comparative thermal testing of having an:
A) 140mm intake fan on top of the PSU shroud located anterior and superior to the PSU
compared to a
B) 140mm fan in the same anterior position, but at the bottom of the case with PSU shroud removed?
https://hardware-helden.de/der-perfekte-airflow/?showall=&start=2 This is the best I could find, but they only tested intake at the bottom of the case.