Door rail and sweep alignment

Thank you for presenting your question to us, Mark. We do not feel as though it is really necessary to install your piece in an angle as you had mentioned. Personally, when I installed my shower door sweep, I mounted it level across the door. The sweep has a lip to flow the water away from the door. I hope this provides your answer and clears up any confusion you may have had. Make sure to get back in touch with us and let us know how everything worked out for you.