I just started using HA and I have hard time finding switches that work with low voltage. I want to use them to turn on leds either with HA app or rocker switches which I already have. I found some relays, personally I could use them ignoring physical switches but then my parents would not be able to turn them as I cant imagine them using app to do so.
I used some sonoff switches for short time couple years ago and I may even still have one but they are rated for 100-240V so I doubt that they would work
I am also open to some DIY solutions but more interested in premade solutions