503 box shelf for echo dot or else

Needed a clean and simple way to hold my echo dot 4th in a high 503 box. once the charger is too protuding and only object available was for horizontal sockets i chose to remix the shelf of Netlello adding an hole for cable and rounding the shape, minor structural differences. Now i could print proper echo horizontal holders and screw them to the shelf as i am still scared that sound vibration could slowly move the dot and make it fall xD