These wireless LEDs work in a similar way to wireless/Qi chargers. Each LED has a coil to receive power wirelessly from the main coil hidden in the platform. This allows to place the LED where you'd like in the model. I used mine to create a fire effect on my Charizard's tail. 

I created two different platforms. One circular and one oval shaped. Both allow the same coil to fit. 

Amazon LED and coil linked here: