Bite your tongue! Move slowly toward the door! :D

Seriously, thanks for the info - didn't know it was a legal requirement for HID.

 

I don't have the mental energy to answer this in the depth that it deserves right now, but in short, you are indeed confused.

Read the following and then get back to me with questions:
http://www.miata.net/garage/lighting_options.html
http://www.dimebank.com/Light-up.html#aiming

 

Actually it will - slightly. If the car is on an incline pointing nose down, or the rear wheels are up on a speed bump etc. there will be a little more weight on the front of the car than the rear, so they will adjust. It wont be anything like trying to shoot them level but there will be an adjustment.