Cheap controllers are light dimmers. Nothing more
The issue is they will cut/switch mains ac at peak voltage (340v in the UK yes 340)
The harmonics / spikes are hurrendous
Put two of these on the same ring or circuit and you are just asking for a kaboom.
Decent digital controllers cut /switch when the ac voltage equals zero. Ecotechnics does this well when I've probed the output
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