The Quad Lock® Universal Adaptor can be directly adhered to smartphones, GPS units, cases, iPads / tablets and most flat metal or plastic surface and is compatible with all Quad Lock® Mounts.
It's been on the back of my Iphone se for the last 4 months riding to work, weekend tours and a one week SW tour. No issues with it slipping / connecting to the Quad Mount. Definitely would recommend this to anyone looking to mount their phone!