I have two questions: 1. How scratch resistant have you all found the the anodized aluminum on your iPhone 6-7? Does it scratch easily? Not so much? I have a matte black 7 Plus. I suppose in a way I expect mostly case-less iPhone users to answer this but would love anyone's feedback. 2. I currently have a metal plate stuck to the inside of my phone case so I can put my phone on a magnetic car vent mount. Has anyone placed this metal plate with adhesive directly onto the back of their phone instead of on the case? Any difficulty in removal or damage to the phone back a year later?