E,
I point mine up, but just enough so that they don't break the surface... I get a slight ripple in the water..
I'm sure it is not technically correct, but Weir doors make it appear to the pool water that the water in the skimmer is lower than the pool surface.. So, water wanting to run down hill will flow into the skimmer faster with an operating Weir door...
Thanks for posting,
Jim R.