Why do I need a switch?

If I change the 9v PS’s,  I’m hoping to find one LPS, with two outlets. Use only one AC plug, less clutter.

@erik_squires 

My DAC has a LPS built in and I bought Teddy Pardo for my streamer, but it’s got a special cord and it’s 5 volts and these little guys need 9.

Also that article is interesting. But I wonder which is better, the fiber or the capacitor route?

If you have enough ports on your router, you don't need a switch.  Of course, listen and make sure you are enjoying your music.  FWIW, I have a switch between my router and my streaming device, but only because I needed extra ports in the room.

English Electric 8 switch
 

This is a really good switch and I was lucky to have found and bought it for about 600 bucks Plus they give you a decent Quality shorter ethernet cable and the connecting power cord is of very good quality. 
 

It's an elegant looking switch and the blinking lights are very subdued. It's built very well and all the underlying technical rationale is very compelling.

So the TP-Link boxes are installed and everything seems to be working,  but I really don’t hear any difference. I’ll give it a few more days to break in or whatever and if I still can’t hear any difference, back they go.