Very expensive rack mounted enterprise equipment exists, and there are also these guys: https://www.css-timemachines.com/product/time-machines-precision-digital

Very expensive rack mounted enterprise equipment exists, and there are also these guys: https://www.css-timemachines.com/product/time-machines-precision-digital-wifi-clock-2-5-x-6-red-digits-black-case/ https://www.css-timemachines.com/product/time-machines-preci... They have anything you need. Simplest is their WiFi clock which just syncs off NTP already on your LAN, but they can set you up with GPS sync too. You can find at least some of their stuff on Amazon if you search.