Average load for me is about 750W. I run my desktop from one of the UPS units in my rack, so when that’s on it sits around 1.1kW.

The 750W load is across 4 rack servers(1 is the NAS with 12 disks) and 3 switches.

Unless someone has physical access to the ports/switch that the traffic flows through, they would not be able to see anything besides broadcast/multicast traffic if they were just snooping with Wireshark. The internal switch of proxmox and any hardware switch you have will forward unicast traffic to the ports those Mac’s reside on, so without port mirrors setup, no one but you should be able to see that traffic.