if you have access to x710's then you should be using SR-IOV alongside them - you'll find significantly lower latency, better performance, lower cpu usage and hardware offloads
so your setup would look like either having the internet plugged into a managed switch and setting up a PVID vlan and then connecting your x710 PF to the switch to access that vlan, having a single cable for both WAN + LAN (using 2x SR-IOV interfaces) or setting up multiple cables and passing through a whole PF + an SR-IOV VF and doing LAN + WAN that way