The "installation" is child's play. The whole holds even without glue. As a mobile phone holder, we use the expensive, but perfect "iGrip SmartGrip R" and as an intermediate piece the "Hama keeper" joint base "4L". It is incomprehensible that no 4-hole locking system Holder is included. But the system probably lived more by the combination ProClip + Brodit Mobile Phone Holder.