Problem solved!
I have also DL380p G8 with first passthrough NVIDIA GTX1050ti for the 1st winddows 10 and second one NVIDIA Quadro K4000 for the second windows 10.
Both of them works without issues!
What I do:
I only passthrough the video and not the HDMI sound.
For sound I use Virtual Sound called VBCABLE.
In advanced options I add the next:
hypervisor.cpuid.v0 = FALSE
pciPassthru.use64bitMMIO = TRUE
pciPassthru.64bitMMIOSizeGB = 16
pciHole.start = 2048
I can restart, shutdown without any issues.
Thanks,
Ubey