Technically yes they work with almost anything, but the real problem isn't compatibility but power: your TP-Link has a consumption limit (usually around 3,680W), and both the fridge and washing machine can exceed it, especially when the compressor or motor starts up. If you plug them in and the smart device overloads, it'll just cut the power to protect itself, so nothing gets damaged, but you'd lose the functionality. What I'd actually recommend is checking your plug's technical specs to see exactly how many watts it can handle, and comparing that to what your appliances consume (it's usually on the device's label). For things like that it's better to get a plug with higher capacity or just leave them plugged in normally without a smart controller.