Patches have now been updated to allow MacOS Monterey Beta 1, 2 and 3 booting. There are still some issues booting beta 3 for some users. Mainly MSI X570 boards.
As a MSI motherboard user, I can confirm that on Beta 3 and 4, the installer can't recognize the NVME drive (stuck at NVME assert failed).
Success on Beta 2, but no luck on Beta 3 and 4.