I use this to remotely reboot pwr on/off my rigs

https://www.aliexpress.com/item/32641809240.html?spm=a2g0s.9042311.0.0.27424c4duNVoA1

You can install a software that comes with the relay on a local PC with Awesome Miner, my mining farm is like 200 km away from my home. I only go there for cleaning and repair, last time was like 6 months ago