Ceramic hob power monitor

Hi everyone

What would you recommend to measure power of electric hob? Mine max pow for all 4 zones is 6000W. I have a few Sonoff Pow 2 which work great however I think it wouldn’t be safe to use it, even if I rarely use all 4 zones.

I would like to also measure washing machine, dryer, washer , water heaters, high electric power consumption devices in overall .
Some of them uses up to 2.5 KW as per manufacturer, would you use sonoff for them? If so, what would be the max power load you would decide to go with sonoff?

Any advice would be very welcome.

thanks