How many power supply devices do I need?

Depends on where you live. Contact your local utility to determine whether they need to build a new dam or coal fired plant and run dedicated lines for each component. 

This sadly is the point where it must be stated I am kidding. Just plug them in. No kidding.

Good humor MC

I find it interesting that you would not spend a few hundred $$$ on an Endpoint/Streamer to isolate your DAC from the Core/Nucleus but you are willing to spend several hundred $$$, or more, for one or more Linear Power Supplies... Good luck...

Just get Teddy Pardo's to replace any wall warts. Most all power values are available.