From 5.32 SIV has full ASUS WMI support which has been validated on Crosshair VII Hero + Crosshair VI Hero. It should also work on the Crosshair VI Extreme and I would be interested to know how it does.
The Strix B450-F (0504) + Strix X470-I (0701) BIOS are broken and SIV 5.32 would not even start. I managed to work around the BIOS bugs for SIV 5.33. I have reported the issue to ASUS and suggest asking ASUS for a corrected BIOS.