The 'proper' technique is to lay the bars on a flat surface with the drops and bottoms of the levers against the surface (pull the stem off the bike), like so:



But I reckon that's poo, except for climbing... plus I reckon it looks lame.

I do mine like this:



The brakes and gears are easier to reach from the drops, and I have a nice, stretched-out aero position with the heel of my hand in the hook on the lever body... it also looks wicked : )

Almost the same technique as before, only set one lever where you want it, then use the flat surface to make your tripod square.

As for the lateral angle on your levers, you'll just have to eye em up. I like em to point inwards by 5 or 10°; I reckon it's more ergonomic and also serves to protect your levers slightly from crash damage. And... it looks better : )