Its called inverted mounting. Mounting it either way will have no impact on the sound.
Yea, it is mounted like that for show.
I know an installer for www.f650pickups.com here in town that installed 4 kicker solo x's in a XUV. Looks pretty wicked. http://www.icixsound.com/vb/icixnati...es/886_118.jpg
Good luck.