Ac cable length choice to make with conditioner

Hi all,

I am looking for advice on choices for moving my equipment around. 
I have a Meridian 2.1 system.  In its current set up in the living room the speakers all go into a Shunyata Hydra 4 with 6ft Audioquest NRG-Y3 cables to each speaker.  The hydra and streamer are between the speakers under a couch. 
I am getting new couches and there is no room underneath for the equipment.  
I can put the steamer and hydra in a closet of to the side. 
Here are the options :

Hydra in closet new cables  probably Supra  lorad 3x2 5 mkii  for flexibility. 1 run would be 18 ft. the other 6ft.  
or

Power the speakers directly from outlets

or 

put small conditioners by each speaker.
Such as Transparent PowerBank 2 In-Wall Or Shunyata  Venom Defender 

I guess the question is a 18 ft mains cable too long? 

thanks for any advice