Powerline traffic stays in plug?

[calzor suzay]

Hi,

I have a TP Link AV 500 powerline kit that looks as below.
If I plug two devices into the larger unit I'm assuming they will route traffic to each other directly and won't go out to the power and back in again slowing it down slightly vs just staying inside the plug unit.

I'm basically plugging a Raspberry Pi and qNAP into the same plug and hoping to not slow it down too much.

 

[thiggins]

Ethernet traffic stays local on the switch chip. Doesn't touch powerline.

 

[calzor suzay]

Thanks very much
I guess I can test by unplugging the other adapter and see if the two devices talk to each other as well.