By making sure the nvme drive is the only one plugged in when you install windows will determine what disc zero is
You select the drive you want to boot Windows from in the BIOS.
Yup the mobo has the numbers printed beside the ports.To my understanding the roles of drives to determine their disk number identification remains with with the way one has them plugged into the motherboard.
My rule has always been when installing windows removed any other hard drives, ssd and then install windows on the single HDD, The reason is that I had issues long ago where even though i installed windows on the C drive it then also used the other hard drive for other stuff, meaning i could not remove it because windows was using itBy making sure the nvme drive is the only one plugged in when you install windows will determine what disc zero is
My rule has always been when installing windows removed any other hard drives, ssd and then install windows on the single HDD, The reason is that I had issues long ago where even though i installed windows on the C drive it then also used the other hard drive for other stuff, meaning i could not remove it because windows was using it