Holder for devices

Shelf-holder for devices.
The design is fastened with screws to the bottom of the bookshelf (I think you can twist the m on a horizontal surface)
I have placed a mobile phone in the holder, the phone is now always in place and does not interfere on the desktop.
In the second holder, I placed the HDD with the content for the smart TV. Everything is neat and functional ...
Internal dimensions (overall dimensions of devices)
Height-19mm
Width-88mm
Length-139mm
The phone sticks out a bit from the holder. In this case it is more convenient to get it. My phone with a diagonal of 5,5 inches, everything is OK!