I've got a Z-Wave smart double light switch that I would like to try and install on one of the switches in my house. The light switch requires a permanent neutral at the switch which one of my light switch seems to have. Currently my light switch has a common wire which is live feed and then on each switch it has the L1 wire going to the light. I've attached a picture of the new Z-Wave light switch and the wiring diagram. Seems a bit unclear, can someone help explain where what wire goes from my old switch to this switch?