The ground on my Kill-a-watt broke off because the device just barely intrudes into the other sockets space, and you're tempted to just force it to fit. It stopped working once the ground pin detached. I opened it back up and soldered it on, but it's still wobbly.
I use 1' extension cords now to connect it. My preference is still the TP-Link (Kasa) models because they are the same price, yet have extra functionality like measuring tenths of a watt rather than rounding up, data logging, scheduling, and remote control of the outlet.
Last night I connected our small on demand hot water unit to it and set a schedule so that hot water isn't being made when we're sleeping or gone. I'm also monitoring energy consumption and will throw that into an energy audit spreadsheet.
Last night I also installed that $100 whole home monitoring system I mentioned above. Seems to work great, but it isn't capable of measuring below 40 W consumption, and the precision is not as good since it's an inductive meter. I've got the main feed monitored along with 8 branch circuits.
My idle consumption is about 500 Watts. I better track thost phantoms down.
https://www.amazon.com/gp/product/B0...57HPVTEJ&psc=1