Hahaha, where did you get that picture of me?
I had those in my case mod (PC) 15 years ago...a nice subtle light source. But those converters make a nasty high frequency sound. Impossible to hear in a car, but still. Not sure, if they still do.
I would try not to have them right in your eyes, they should be e.g. behind the front trims (not an easy task, but who doesn't like a nice challenge?) to create that ambient light we see in nowadays cars.
Less is more (who am I to say that), but I am sure it will work in our Boxsters, too.
My choice would be amber and maybe within the center vents.
Not sure if they are bright enough to lighten up the footwell.