I had an Audi 4-series when I first got my concealed carry license. It had this great drawer underneath the driver seat that was perfect for stowing my handgun, a wrap-around holster, and a spare clip. I do not carry on my person all the time (that's my choice), but I do keep weapon in the car at all times, and take it with me when I see fit. (I know the arguments for full-time carry.)
Now I've got a BMW 3-series and there is NOWHERE to stow it except the glove box (which I hate). The center console is too small. There is no space between the front seats. There is a speaker on the floor underneath my driver seat. And the area under the steering wheels slopes so that an attached holster would not be properly concealed.
I have a kydex holster (actually a Crossbreed holster that I want to convert) that I can attach to a surface, if I can find a concealed surface within reach.