Just an update - I copied the RAID utility from macOS High Sierra and after copying it to the Monterey Application folder and restarting I can see that the RAID card is now working, unfortunately when I try to shut down the Mac it freezes and the RAID application doesn't work either. The temperature in PCIe slot 4 (slot for RAID card) and the RAID card shows a temperature of around 8O C !!! And the two HDDs in position 3 and 4 are also very hot.