I always have one side of the awning lower than the other side... This makes the rain water flow off the awning. Both my awnings are manual but I think you can setup the auto awnings to do the same thing...
I didn't do this one evening and we went to bed and I forgot to take down the awning. It rained during the night and I had so much captured water it would not allow me to open the trailer door. Got exciting for bit while I figured out how to get out of the trailer... I finally found a broom and pushed up on the awning to drain off the water enough to let me get outside...
A good way to make you learn not to forget things...
Roy Ken