3D printed the gray case to hold RGB controller and RGB amplifier. 3D file is call badass Arduino Box an it is on thingiverse. https://www.thingiverse.com/thing:923242
Toggle switch turns the amplifier on and pushbutton turns the RGB on.
used 4 of the 1- to - 3 splitter to help run the my wires the way I wanted . The wires that comes with kit are way to long so I ordered 4 of each of the lengths 6, 12, from the Extension Wires. $3 for each one. Also for the front and rear sides of the bumpers I added 2 10", lights for each. For any under glow just have the straight light strip along the front and back is not enough so I added the extra lights to light up the sides of the bumpers.
Got the RGB amplifier from ebay. How do you know when you need an amplifier? I kept adding more and more lights once I hit the limit, on some colors the RGB would all the sudden flicker / pulse. So I added the amplifier on the interior , under hood, and halo circuit. The under glow was on a separate circuit. All the lights work from one controller.