I bought a amp from him and he sent it out the next day, because i paid at night, and the amp came packaged very well, wouldn't hesitate to buy from in the future!
you could gorilla glue it on, but that might cause it to take a piece of the window with it next time instead of just the mirror. I would just go buy a new sticky pad for it and put it back on
well you can run the ground without any covering on it, but i wouldn't recommend it because if it touches something that has a positive charge its gonna short. Best bet is to just use wire with insulation on it