Could a switchbot control a rocker switch?
Do you mean the SwitchBot button pusher model? It can, although it’s a little ugly looking. They give you a little adhesive sticker, and you have the button pusher push and pull that.
What if i have 2 switches to control one light ?
Doesn’t make any difference. The SwitchBot button pusher is basically just a robot finger. It pushes the switch in the same way the human hand does, you don’t change any wiring, everything works just the same.