Beeline Moto II Amps 4 Hole Base

I bought this fixing so it could go on a base plate and then fix to a ram mount. There are 4 holes and I mounted using the self adhesive pad. I also threaded a plastic tie through two holes.
The adapter plate goes into the mount to attach sat nav to bike. The charging pont is at the bottom of the sat nav and the idea is your turn it so it goes into position. However there is a small screw in the middle of the base ,you need to tighten this up if not when you come to remove the satnav it just spins round and you can't get it out. There are no instructions in the box . Alternatively you could use velcro instead of the stick on pad.