installing component speakers

In a 2001, where does the crossover get installed? I am thinking of buying these but I dont want any small crossover box in view.

Normally in the door panels.

I installed Mb Quart q series seperate componants in my xterra . I mounted the crossovers under the passanger seat. I also made fiberglass boxes for the midrange speakers and installed them in the factory door locations. The imaging is terrific and having the crossovers where they are protects them . At 1400 $ a pair I wanted as much protection as possible . I can send you pictures Via E-mail if you want . The install looks great.