Your power cable can't make up for inadequacies on the way to your devices. At best, you can minimize voltage drop without actually improving noise pickup, a balancing act.
The two rules I live by are to keep noisy things out of my clean power zone. That is, after conditioning I avoid any cheap wall warts used for network devices especially but also sometimes streamers.
I also use shielded cables after the conditioner to minimize noise pick up caused by crossing paths with digital signals and/or noisy power supplies.
So, I focus on keeping the after conditioning power as clean as possible, but if the area around your equipment crosses digital (i.e. Ethernet) much I might put a shielded cable before it as well just to keep as much out.
I wrote more about my views here:
https://inatinear.blogspot.com/2019/04/power-management-for-frugal-audiophiles.html