Two NICs two subnets

Oh and by the way..... Why use 2 nics?
If you use the onboard nic as vmbr0 like you have already, then create some VLANs on vmbr0 and that's it.
Your unifi machine will handle trunk ports and VLAN traffic.
 
Oh and by the way..... Why use 2 nics?
If you use the onboard nic as vmbr0 like you have already, then create some VLANs on vmbr0 and that's it.
Your unifi machine will handle trunk ports and VLAN traffic.
In this situation, where there are only 2 Net's than using only 1 NIC is fully enough. You are right.