A mounting device for mounting one or more illumination devices and wiring harnesses on a mounting surface. A substantially flat platform includes a front side, a rear side, and three or more peripheral edges. The platform has a plurality of apertures therethrough for mounting the illumination devices thereto with mechanical fasteners. Two or more standoffs are each formed preferably at the peripheral edges of the platform, forming a gap between the mounting surface and the rear side of each illumination device to direct heat upwardly away from the illumination devices. As such, the illumination devices are mounted to the platform with mechanical fasteners, the wiring harnesses are used to connect each illumination device to at least one other illumination device and/or the power source, and the platform is mounted to the mounting surface with screw fasteners at each standoff.