I'm looking for advice about which screen protector (glass/plastic and brand) to get to go with the Tech21 impact check case. I have an iphone 6. Is glass necessary for use with Tech21 cases? I like the Tech Armor ballistic glass, but I'm concerned the glass may go above the edge of the case. Anyone have pictures of this combination? Or any suggestions? I'm not looking to spend a lot, but I do want quality. Thanks!