I've had good luck with the two-tone brybelly cloth, which you can find on amazon. I can find a link if you want to go that route. Your auto trim is the gold standard for ssc, though. Might be pricey for a topper.
Not really. When I stapled it, I cheated a little toward the folded position, so that opening completely flat adds some tension to the cloth. The foam and strip hinges make it so the folds aren't so tight that you get a good crease, too.