A 10G NIC is unnecessary. I've used iVentoy with a dozen laptops installing Linux simultaneously with no obvious slowdowns hosted from a Dell Optiplex Micro 7050 (7th gen i5, 1G NIC, SSD).
Yes, I have used iVentoy very much in the past as well. However, running a dozen (+12) simultaneous installs of Linux seems a stretch for 1G NICs. Using a small PC with a 2.5G NIC could probably do just as well as the 10G one - just slightly less expensive. The 2.5G NIC hardware has really come down in price; you can get an 8-port 2.5G switch for $45, and many mini-PCs have 2.5G built-in.