Back in the days i tried these wifi adapters but because of the high risk of electric hazard i stopped using them. There is even customer pic on amazon what could happen.
The issue with those adapters is that they aren't meant for mining rigs pulling 1500 Watts of power constantly. They probably rated them for 15 AMPS because they assumed most people would pull less than 100 Watts from them. If you open them up you will see poor soldering jobs and see a fire risk.
I had a similar issue with a Kill-o-watt I ended up killing. Basically used it for years and for a few times went close to 1800 Watts or so, no issues. I only used it to measure power NEVER left it connected constantely. Then one day with a few Antminers I forgot about it being plugged into the wall, after a few days of 1500-1600 Watts I disconnected it and it was melted on the plug.