tailgate reflector

Here is how to install brake sequential LED inside the trunk/tailgate reflector of Kia stinger buy the kit from here: Kia Stinger Trunk/tailgate Reflector Break sequential Led | eBay

Does anybody know if LED can be installed behind the reflector on the trunk door , the one shown in the picture. if yes , how do I access it? the plan is to install LED to act as if you have spoiler installed. I am not sure what it is exactly called. I hope you get what I mean. Thanks