Also smart PDUs usually cost a lot, it is cheaper to just install some contactors and control them with smart wifi devices like Sonoff, that will also allow you to install voltage protection, phase sequence and other types of controls.
That's quite smart. I just checked Sonoff website, it seems like they have a pretty cheap 16 amps "Smart Switch"
https://sonoff.tech/product/diy-smart-switch/minir3/ , which should be fine with Antminer S19 85TH (consuming only 3 kWh)? It will be loaded at ~86% though...