15A vs. 20A power cord questions

Regarding the phono-pre, this is down the line. I currently only use an integrated and a turntable. Which duplex should the turntable be plugged in to?

Will a burned-in/not burned-in receptacle make a difference for the turntable motor?

Do I need to burn-in each of the 4 receptacles. For instance, just because i’m running a box fan in one receptacle, that is not burning-in the entire duplex, correct?

@jea48 @zephyr24069 I am already hearing substantial improvement with clarity, space, noise floor and soundstage depth. I can now listen at lower levels with excellent detail retrieval which was a goal as our master is above our music room. I noticed a difference from Saturday (install day) and last night so about 53 hours in. The sibilance and grittiness is not as pronounced as it was at first listen.

Question, I am surprised that when I plug a male blade into the receptacle it is not overly tight. I believe this is by design as not to strip any type of treatments that aftermarket power cables may have. When you plug in, it slides in and sits but it never feels so secure that I would have to put my foot on the wall and pull hard. I should note that I am using standard IEC 15A power cables that came with my Rogue Cronus Magnum and VPI Scout turntable. 

I bought the receptacles from HiFi Heaven via Ebay (about $180 per rather than $240). I talked to them this morning and the gentleman tested a plug while we were on the phone. He had the same experience.

I’ve read several reviews of this wall receptacle that have used descriptors such as "vice like" when referring to the grip.

Do either of you have this wall receptacle or similar that emply a similar technique and if so can you comment?

I did not find the GTX-D Rhodium or Gold outlets to be loose on any blade; I did not find them to have the heavy locking behavior of my old Oyaide R1s either.  The GTX-Ds were easy to work with when it came to stock power cords and the blades could be inserted or removed with nominal effort. They were not loose per se....with my after-market (Elrod) power cords which all use very large Oyaide M1F1 or Furutech FI48 or FI50 ends, the grip was extremely firm but still not locking in nature. Hope this helps...I think you will really come to love these outlets once they get a full dose of burn-in...

@zephyr24069 thanks, I would describe the hold much as you did so I think that's normal. I would assume upgraded power cables may have larger or more robust blades which would enhance grip. I think there have been immediate improvements although since I upgraded to a dedicated line, 10awg wire and the outlets I'm not sure where to give the most credit.