What adhesive to use to make magsafe accessories semi-permanent?

[restock3eee]

I put the magsafe charger on the iphone air with apple clear magsafe case and it does easily move, such as slipping the phone in and out of pockets. What is a good adhesive to use?
How do people attach magsafe wallets to their phones and feel assured it won't slip off? Seems like I would glue it on....hahahaha

 

[Ifti]

The whole point of using magnets is so you do not need to use adhesive......