Funny when you wrote "useless things". On one wall socket with 2 entries, I have 4 rigs so 4 power cords to plug, how do I do without at least a power strip? So FP91G you don't look how many watts you draw from your wall sockets? Not surprising that some people put fire doing mining rig. Understanding the electricity and monitoring it is super important for safety and business management.
Before starting mining, I installed new wires, bought and installed the required number of sockets.
Controlling consumption with a wattmert when setting up a farm.
If one of the farms consumes more electricity, then I will see increased consumption when I take data for transmission to an energy-intensive company at the end of the month.
I can install a good digital voltmeter-ammeter ($ 10) on each wire and watch the readings through an online camera.
But every farm I have is plugged into an online outlet. I manage all farms from my phone. I can control power consumption and remotely turn on and off the mining farm. An online smart plug costs $ 20.
https://www.tp-link.com/de/home-networking/smart-plug/hs110/The link you provided in is Deutsch.
The smart plug, I think you have to be cautious if you put too much Voltage it can melt.