I did a test with running two VM's simultaneously.
VM1 has: 02:00.0 0200 --> boots, to NICS are visible with "pass all functions"
VM2 has: 01:00.0 0200 --> does not boot and errors -->
-device vfio-pci,host=0000:01:00.0,id=hostpci0.0,bus=pci.0,addr=0x10.0,multifunction=on: vfio 0000:01:00.0...