"IF NOT" - The outlets in the back of the unit will probably provide the most benefit - the rest of the internal circuits will probably not provide any real benefit.
Furutech has a couple of distribution boxes without filters that work very well, just because of the quality of the outlets.
What will provide benefits are - effective power cables.
KLE Innovations have a few power cables that would be of benefit
Others from Pangea, Signal Cables and Less Loss are pretty good
If you are into DIY you can try my own design - see
Power conditioners and Power generators are very effective in areas with noisy power supplies into the house.
You do normally hear improvements, but as I said, it's mostly due to the better quality outlets in them.