Satellite 6 - Creating New Hosts: Requiring MAC Address

My apologies if this is documented elsewhere, but I have not found anything on this specific item.

I just installed Satellite 6.1 Beta and am going through configuring everything. I'm at the point where I wanted to provision a new host. In the process of creating a new host, there is a section on the Network tab that requires the MAC address of the host. This is confusing since the VM hasn't been created yet, so how would I know what the MAC address is when the system doesn't exist?

Hopefully, this is just something simple that I'm overlooking.

Thanks!!