Definitely not a popular mod and won’t be found on 99.9% of cars on here including mine, but I have a friend all about underglow. I think he has XK, but is excited about low glow.
My opinion would is not to do anything and keep the stock underglow.
On a serious note, make sure you're checking local laws OP. Can't have lights of certain colors etc, especially when driving. Unless you're hard parking your supra of course.