Much like this one here: https://www.instructables.com/id/iPhone-Nano-Bluetooth-Headset-Docking-Station/ only a bit cleaner looking. You could put a mini usb hub in there if you wanted, but mine just runs both cables out.
Step 1: Where to Make Cuts...
For the charge cables: Set your device in its newly cut cradle (on top), and see where the charge cable lines up. Make cuts on either side, and make the cuts at least half the depth of the cardboard. This is so that the device stands more upright and so the charge cable has space to hang freely.
See picture for more obvious explanation. :D The second picture shows the corner cuts better.
Step 2: Cut Hole in Back...
Step 3: Completing.
So now you can put the inner box in the outer box, and angle it to your heart's content.
I secured it with black electrical tape as to not mess with the decor :P