I place 'em relatively flat. As flat as possible without hitting the rims. I hate how people slant them so much. It looks like shit, and the bounce plays like shit like that too. Look at neil pearts kit. It looks very similar.
I play progressive rock which requires alot of different sounds IMO. high toms to low toms. It gives me a broader area to be creative and play what sounds best. Hearing the same tom go in fills over and over again in every song sounds gay I think. Lots of bands just need someone to lay down a sick tight beat, and you only need a 4 piece for that. My band like to complex big feels and synchopations that require more pieces of percussion to acheive a more attractive sound. It's all in the taste.
Bands like RUSH, TOOL, Dream Theatre all have huge drum kits.
IMO Neil Peart is the shit. His drum playing has inspired me so much. I know it's almost cliche' to say that about him, but he really has. RUSH has been my favorite band since I was 4 years old.
Go play a 4 piece. Snare, bass rack and floor, then go play a set with 6 toms and 4 crashes, splashes and chinas and come back and tell me it isn't 10 times more fun and exciting to play a kit like that rather than the basic jazz setup, as well having the option to explore new sounds and possibilities.