If you decide to go with the Albert's Porter Ports, you need to be aware that they are not IG outlets. In my case, I used Porter Ports for all my listening room circuits. I terminated each of these circuits with a plastic receptacle box so that there is no ground necessary for any of the receptacle boxes. The Porter Port receptacles are all individually grounded back to the circuit panel with separate 10-gauge conductors.
Since you mentioned that your receptacle boxes are metal and are, apparently, already installed, I am inclined to think that you would do best to carry your true IG configuration through to fruition through the use of audiophile IG outlets. However, I defer to the experts.
Since you mentioned that your receptacle boxes are metal and are, apparently, already installed, I am inclined to think that you would do best to carry your true IG configuration through to fruition through the use of audiophile IG outlets. However, I defer to the experts.