You dont need to add any hardware to use the original power cable that comes with your Google Nest Mini (2nd Generation) and Google Home mini.
1.Plug the USB adapter into the Google Home Mini.
2. Push the Google Home Mini into the cradle.
3. Wrap the cord around the cord spool
4. Insert the plug into the hole of the holder.
5. Plug into socket.
Tips If your device is Google Nest Mimi (2nd Generation), you need to remove the louver ring.