6x VxRail nodes installation

Hi All. I'm about to install 6 nodes VxRail cluster 4.5. Couple of things I'm trying to figure out so I can start:

- Can I power on 6 nodes so I do the installation in one go rather than starting with 4 nodes then add the reaming 2 to the cluster?

- I can see that I can use a VLAN for vSAN, vMotion and VMs during installation wizard but why there's no VLAN option for managment? Does this mean I'll add the VLAN to the ESXI hosts through DCUI after installation?