Usually boot up installer with a gpu installed then pull it after it has an ip and basic config then you can access via ssh.
That’s the thing though, I have a strong preference for having a tiny GPU in the box and not juggling cards (in large part because I don’t have video cards that will fit inside a half-height slot). I suppose a tiny video card is still much cheaper than the premium for AsRock Rack. But, the tiny GPU on the AsRock Rack board is gonna be more efficient.
Honestly I would stay away from b450 tho as you lose the ability to split the 16x gpu lates to 8x / 8x allowing more expanion cards in the future (HBA 10gbe etc)
AsRock Rack has x470, and two NICs, and I get to play w/ IPMI (never have, kinda wonna try), and it’s purpose-built for uptime (whatever that’s worth).
I said “minimum viable”, but I’d rather drop an extra 2-3 hundred bucks than have the system be more complicated/less-straightforward to administer.