Will line conditioner do anything for the other receptacle in a duplex?

If a modular device (e.g., Venom Defender) and a whole house device (e.g., EP-2050) can "clean" the adjacent circuits, how is a power conditioner different?

@millercarbon could you recommend a brand. I would like to try one, starting with just one receptacle. Thanks!

I'm going to recommend what I just bought: Dave Elledge's P.I. Audio UberBuss.

Best conditioner around. And fair price as well.

Clearly I really need to stack my Bright Star Little Rock on top of my Puritan PSM 156.

Hello,
The Puritan PSM156 or PSM136 will do this. It filters out over the air signals like WiFi, cellular, and Bluetooth. It also filters out noises from DC, compressors, and switch mode power supplies. It is incredible. If you are in the Chicagoland area this store lets you try before you buy. https://holmaudio.com/
They also have the Guardian power plug filter.