NCASAUmp
Un-Retired
you should only be listening to the ball hitting the glove, Look at the feet touching the bag and the sound of the ball hitting the glove.
Why would you rely on a sound that may or may not be there? On a soft catch of the ball, there won't be much of a sound. Your position substitutes sound for sight on one of the four major elements of the play: ball, base, fielder, runner.
A 45 degree angle to the base still lets you hear the sound of the ball hitting the glove, but also gives you the added benefit of SEEING the catch.