PS Audio Powerport calssics look great to me.
I ordered two 5 packs. $49 for one outlet and $190 for a 5 pack.
Spoke to PS Audio on the phone and they told me that the first version of these did affect the male plugs, when plugging in and out, they said that has been corrected and no longer an issue.
"The Power Port is a high-end AV grade AC receptacle that will make a significant contribution to your system’s performance."
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1-800-PSAUDIO
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PowerPort Classic
The Power Port is a high-end AV grade AC receptacle that will make a significant contribution to your system’s performance.
At the heart of everything we do with AC power is the interface between our equipment and our power sources; the AC receptacle. Unfortunately, standard AC receptacles are made from cheap brass that does not provide the best levels of conductivity. The Power Port™ is a custom built, isolated ground, 15 to 20 amp receptacle that will insure a life-long level of excellence and superior conductivity. The Power Port exceeds hospital grade for grip strength, contact resistance and current delivery. Easy to install in your wall, this is one component you need in your listening room. 15 coats of polished nickel over high-purity brass, with the “grip of Mickey Mantle” and polished nickel plated hardware, this a must have in your system."
https://www.psaudio.com/products/powerport-classic/