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.

ddude
so connecting nucleus directly Via usb to dac is not healthy? 

so I need a device between these two components? Which ones make sense.  My wife is away and she left me some blank checks. Thanks.

There is no "isolating". The thing about my humor, once you experience and understand what's going on its the dude's post that's really funny. Seriously. Just plug em in.

ooooohhhhhhhhh.

Why do you need an external LPS on the amp and AVR?  

The HDPLEX looks interesting with it's variable voltage. But it does not indicate amperes.

I owned a Chord and it really does benefit using a LPS.

I dunno, it seems everything needs a power supply.

thanks for info on chord dac.  

Amps and AVR’s have internal power supplies that are sufficient to drive the component. They could be switch mode (SMPS) or some type of linear. On the back of these components most likely there’s a IEC connection, which you plug your power cable into.

The Chord Dac has a small internal SMPS power supply and is able to accept a larger linear PS thru the plug in the back. Typically a linear PS is less noisy and more robust which can improve SQ.

The Roon also accepts a LPS, but I've never used one. You need to ask other Roon owners.

Unless you have a known problem from the power company, I would just think of Isolation from Equipment (refrig; sump pumps; washing machine, ac; whole house fan ...), and Overload/Spike Protection.

I have two dedicated circuits: isolated ground from the panel. One for pre-amp and amp; other for all the sources. That circuit only powers 2 things at a time, my Remote Line Controller and whatever I am listening to.

Regarding protection, I got a vintage unit with specific features

https://www.usahifi.com/sites/default/files/product/494/manuals/Adcom%20ACE-515%20AC%20Enchancer%20M...

Not a big power conditioner, spike/surge protection with sequenced on/off design.

Over 42 years, 5 different TT, current Quartz DD, AFTER their motors warmed up (especially Thorens TD124), never heard any sound deviation while listening or saw effects in strobes.

Another consideration is location, cord lengths, wires passing near/behind ___?

So I have a chord dac, and a roon nucleus, a panaflex power conditioner, an avr and an amp.

It's a "Panamax" power conditioner. Is it something like this...
https://www.crutchfield.com/S-1312SaRhLVa/p_299MR4000/Panamax-MR4000.html

Plug all your components into the Panamax, then Panamax into the wall receptacle.
No extra device needed between Roon and Dac.

Panaflex power conditioner functions like a linear power supply?

I think you’re talking about a Panamax. Panaflex is a motion picture camera.
A power conditioner is not like a linear power supply, it filters and cleans the dirty power and grunge coming into your house. Most of them also have surge protection

Plug your components into the power conditioner to reduce noise from the electrical system in the house. It does not power your components.

https://en.m.wikipedia.org/wiki/Power_conditioner

https://en.m.wikipedia.org/wiki/Power_supply

What really gets me is all this effort trying to squeeze a tiny little bit from the wrong ideas about power when in the end it all goes into a..... avr.

MC, you know that and I know that.

OP: what amp, AVR, and speakers do you have?