The AKG C568 is a short rifle mic and is more sensitive to high frequency sounds in front of it. It achieves this (as do all of this type of microphone) by having a series of 'slots' cut into the barrel of the mic at specific points which allow sounds of specific frequencies to reach the mic capsule (the part that turns the sound into electrical energy) at slightly different times and cancel out.

It is important to position these slots so that they are facing upwards particularly if the 568 is being used on the front of a stage with the underside of the barrell close to the stage floor, as the proximity of a surface to the slots will affect the path lengths taken by the specific frequencies.

So, the short answer is:-

With the slots facing upwards.