I have 6 monitors. 2 into amd board and 4 into 4070. All works fine except when you put computer to sleep, one of those that are connected to Nv does not wake up. The only thing you can do is unplug the cable and plug it again and it will work. This never happens when starting up computer fresh from shut down. Lately is the same monitor but it was random in the past, I guess depending on the port on card rather than monitor. Amd does not do that. I remember in the past hearing Hardware Unboxed mentioning they use AMD cards for that reason because they too like many monitors.
TLDR: There is monitor detection issue after waking up monitor from sleep when using all 4 ports on 4070. All the detect buttons in drivers or system do nothing. The only way is to unplug the cable or restart machine. Fix it.