Staging & Speaker Positions ?

Hi People,
I need a little help with my new speaker install.  The vehicle is a MR2 Mk2, system comprises of:

Kenwood Head Unit
2 x Rockford Puch 8" Woofers in custom boxes behind seats
1 4Ch amp to power speakers
1 2 Ch amp for the Woofers (both bridged)

Here is the question:  Gonna fit Infinity 605CS speakers, Mids will go in the normal door position with the addition of an MDF Spacer.  Now the tweets are the problem, I can either go for the factory position behind the mirrors OR should I mount them in the footwell.

Been reading loads on Staging and it has my head blown open.  How do I best achieve this and what would be the best position for the tweeters.

I have also been told then when I put the tweeters in, as they are positionable, to have the passenger tweeter facing the driver and the drivers tweeter facing the passenger.  AND finally, the crossover, is there any benefit in having the wiring lugs HANDY or can I just bury it in the vehicle once its wired up.

ANY advice would be most welcome to try and get the best sound from this system.

Thanks