Correct position of Topper for Slides when closed.

To the OP, your install looks pretty good!! You won't see any pooling when the slide is closed, but (as with any of them) probably will open!! When the slide is out, the angle of the fabric will be less. Just the way they work.

One question, are there screws into the fabric on top of the rail at both ends?? If not, should be so the fabric doesn't slide in the rail.