A:AnswerI can confirm that yes, this does fit the J7 Crown. I just purchased one myself. As for the belt attachment, I don't think that it was meant for that.
A:AnswerI have dropped my phone a few times. Sometimes knocking it off my desk or nightstand and dropping it as I pull it out of my phone holder from waist high and my phone was never damaged in any way, shape, or form.
Love the Ottrerbox cover.
A:Answer1)Contact otter box at their website for the possibility of obtaining a clip.
2)I would seriously not even consider a "glass" screen for the otterbox case. The screen that is provided is actually built into the case so it would be a solid no as your answer. However, do believe that the screen provided is tough and dependable and WILL protect your phone more so than you could possibly imagine.