Portable phone holder

This is a portable phone holder because you can put these pieces on the walls or on your table and take the big piece out whenever you want and put them anywhere in your house or your office without needing to have more than one of the big pieces,it has a hole to put your charger, there is 2 options ,the first option if you want to put double-sided tape or glue an the second if you want to use screws, the hole is 5mm.This is my first design and I would like if you can comment the problems,if you like my design or suggestions to improve it.