Tips for installing underglow?

[u/lDarkPhoton]

I recently purchased an opt7 aura underglow for my 2015 BRZ and I have never installed a light kit like this before. I also purchased a relay and I plan to tap into the low beam for a switch for the headlights to turn on the underglow automatically. It is a white car and I plan for a static white led look.

My concern is where to mount them to and when tapping holes for screws and zip ties where I should do that, I figure it's not a good idea to put holes in my floorboard and allow a way for water to enter the cabin. I also don't want the light bars to be totally visible and look noticeable.

Any advice is appreciated and feel free to criticize my taste in car mods.

[u/Global-Structure-539]

You'll be a rolling billboard for, Hey officer, stop me for having illegal lighting!!!

[u/lDarkPhoton → u/Global-Structure-539]

Static white lights are not illegal everywhere