I tried the M4 version. Using the HDMI port with four otherwise fine PWM free monitors all were unusable for me. To the point of a bad migraine.
I realised I didn’t try a few things though. I never tried the thunderbolt ports to see if they made a difference. Also, the M4 Pro version has new thunderbolt 5 ports so I don’t know if they will help either. Both are highly unlikely to help, but I haven’t verified them.
Does anybody know which monitor and which attachment method/cable would be most likely to succeed?