Virtualization, Network & FortiGate expert - Network Redesign -- 2

I’m looking for an experienced network expert to help redesign my network setup. I currently have a Dell server connected to a Cisco Nexus switch, which is linked to a FortiGate firewall. I’m using NAT to map external IPs to internal IPs for my VMs, but I want to change the design so that I can assign external IPs directly to the VMs.

I need guidance on whether I should connect my server directly to the FortiGate’s WAN interface or create a new VLAN for WAN1 on my switch. If you have expertise in this area, I’d love to work with you to get this configured correctly.