IME definitely yes. But you can give it a go and if you don’t hear any improvement then just put it back under the rack where you prefer it for appearance.
Next you’ll be saying that you’re struggling to understand why amplifiers sound different. I mean provided they are used within their rated power then surely they all sound the same don’t they?!!!
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That’s quite a jump 
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What is that white disk in the socket?
One of those “child safety” devices that do nothing positive? One thing they are know to do, due to cheap manufacture, is distort the socket often resulting in future bad connections.
They provide NO upside to safety and can be used to override inbuilt protection.
Its universally acceepted that mains power cable can affect signal level & data cables and separation of parallel runs is advised.
Thats for power affecting data, but in the low power applications such as we have in our homes, nothing much affects power cables.
My main concern with them is that they link the P,N and E pins. OK they are non-conductive plastic, but even so even if they conduct on the micro-amp level or less then in sensitive applications such as this they could have an undesirable effect. Maybe they do, maybe they don’t, but I personally wouldn’t risk it. And as you say they really don’t serve any purpose. Still if @Skeptikal likes them then fair enough.
Standard regulation products of great quality.
But as you say if not sure leave to the trade. 
Soft blank to stop ingress of dust in spare socket.
Nothing fancy and no chance of socket distortion.
Only has one pin 
It was that or an empty plug. 
OK then - you’re forgiven! 
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He didnt say which pin !
The socket is shuttered - so no dust ingress.
One pin - can still distort the socket contacts.
And with one pin, assuming earth, makes it a possible tool to open the internal shutters and give easy access to live.
Not the earth though!
No more so than a standard plug earth pin surely?
Yes - but you would have to go out of your way to do that - ie. deliberately!
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On some sockets te earth is shuttered and pressure on that moves the shutters on the others.
A standard earth pin is made to strict tolerances, those pieces of plastic are not.
Have you never come across and inqisitive child?
https://www.fatallyflawed.org.uk/ is worth reading
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Obviously yes if young children are around then ‘safety first’ always and I agree in those circumstances it would be a safety issue.
I take your point about earth pin tolerances but I seriously doubt that the plastic pin would be out of spec so much as to damage/distort the socket. But maybe I’m wrong.
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My mains block sits on the bottom shelf of a 40 cm Quadraspire rack, beneath my NPX TT. Not for any sonic reasons, more because I don’t have anywhere else for it.
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Wow
It’s soft plastic not even the strength anything like a plug.
No children here either and it’s behind other furniture.
No need to take it so far.
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These covers were introduced before the spring loaded covers inside the sockets were, and for older sockets they offered a solution for people with very young children whose fingers could fit into the live terminal. They also prevented the (accidental) insertion of narrow objects such as a screwdriver. The shuttered sockets which are now universally used make them redundant. Then it was discovered that when people (unnecessarily) used these safety covers in shuttered sockets, the springs that held the shutters in place would be permanently compressed, and this could cause them to fail. Then, when the cover was removed the socket was no longer safe. A number of other safety issues were also found, such as the plastic pin in the earth socket breaking off and leaving the shutters open, and some brands and retailers withdrew them from sale.
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Surely no different to being plugged into all the time.
These plugs don’t get removed.
And only covered because they face upwards.
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Does it sound better with or without?
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Sounds cleaner with.
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