I doubt your lan traffic would be heavy enough to worry about. I run proxmox on a lga 1151 system that runs Plex and about half a dozen vms including Opnsense. I have a i350 setup using PCI passthrough. I can't say if it's best practice, all I know on my lan I can utilize the full 1g and speedtest on my wan runs as high as 600Mb on my 1g FiOS connection. I say try it run some benchmarks and see.
I doubt your lan traffic would be heavy enough to worry about. I run proxmox on a lga 1151 system that runs Plex and about half a dozen vms including Opnsense. I have a i350 setup using PCI passthrough. I can't say if it's best practice, all I know on my lan I can utilize the full 1g and speedtest on my wan runs as high as 600Mb on my 1g FiOS connection. I say try it run some benchmarks and see.