For mixers with XLR outputs on the upper surface rather than the rear of the mixer, right angled XLR plugs conveniently allow your cables to travel away from the mixer (rather than upwards towards the sky).
I have a mixer (Allen and Heath ZED-10 FX) in which the master output XLR sockets oriented in such a manner that they do not allow conventional right angled plugs. The plugs would jam into each other?
The ability to rotate the plugs to any angle helps my cables to sit beautifully - I wish I could post a picture?!
And of course a highly reliable and excellent cable