I know a lot of users of this forum don't condone or like the use of emergency lights on personal vehicles, but whatever.

My question is pertaining to some new lights I am looking to purchase for the deck end of my car. I already have two, but they're very cheap and not that bright (especially for daytime use). I found a couple of new lights I want installed, but I have two questions:

1.) I want to mount these on the bottom of the back window. Should either A.) Mount them closer to the middle brake light, or B.) Mount them more towards the outer ends of the back window? I have a regular car, not an SUV or anything.

and...

2.) I am getting the following colors in this order: blue, white, red, amber. I am getting two units, and each unit is divided into two colors. Which colors do you think would do best together? I was thinking blue/amber and then red/white would be good, but I want to hear your opinions.

Thanks in advance.