Hello, I am installing some Kasa dimmers in my home and I have come across some issues setting them up. According to the diagram the "Main Switch" should be connected to the Line, Travelers, Neutral,

Caption Hello, i bought a this 3 way switch for staircase with light at the bottom and top of the staircase. May the top box I have 3 sources of wire bundle: main power identified on top right of the