Yes, the Permaplug Charger Lock 1.0 system can be installed on upside-down outlets as long as they are standard AND the actual receptacle is flipped. In this case, you will be able to install it with the cables facing upwards on the upper power outlet. If the entire power outlet is flipped, the cables would face downwards. Ensure the grounding hole of the remaining outlet is at the lowest point, farthest from Permaplug's larger cavity. The system is designed for installation on the upper outlet of a standard power receptacle.