CLK Underfloor lighting

Hi guys! I’d like to get underfloor lighting on my CLK 320 (W208). But when I looked at the underfloor like this, I just thought, where should they be fixed? Has anyone had any experience there? In Sat.1 Automagazin (believ always comes Sundays) one of some tuners in the studio stood. When I asked Sat.1 for the tuner, only the answer came that they can’t tell me the tuner for advertising reasons. Greetings to Dennis