@tbluml I'm trying to make a MxGPU setup with similar hardware (dell r720, 2x E5-2650).
I got the same SR-IOV errors as you. I added the pci=realloc pci=assign-busses params.
Unfortunately the the system does not manage to boot when adding pci=assign-busses.
Root disk in not discovered and dracut shell is started.
Did you run into the same issue and if so how did you fix it?

Edit:
If anyone else stumbles upon this.
I reinstalled on (usb) disk that is not connected to the raid controller and it seems to work now.
I speculate that since the controller is a PCI device and pci=assign-busses allows the kernel to override pci numbers the raid device cannot be found using the predetermined data in the initramfs. But that might be complete nonsense (no expert in these matters).