Here is the PS Audio device: https://www.psaudio.com/dectet-power-center/ There are no specifications given so I have no idea how much attenuation it provides, what frequency range it attenuates, or anything like that. The parts in the photo do look appropriate, though.
The Furman IT-REF 15l and 20l do have excellent specifications throughout the bandwidth that needs filtering. If you have the budget, these look very promising. Certainly I would feel confident plugging one into my system given the published specifications and the fact it was tested by an independent testing lab. Amazon has the 15l for $2500 and $4000 for the 20l. As I said before, if you want to get serious about EMI it also gets expensive.
The Equitech also looks very good: https://www.equitech.com/productsold/son-of-q-shelf-or-rack-mounted-chassis-systems-2/ All torridal transformers provide good high frequency isolation since it doesn't have interwinding parasitic capacitance that are inherent with the typical E style transformers. I found it online at $2640. The Equitech didn't say much about filtering and surge protection, it has it but I don't know what it has or how effective it is.
The thing to understand here is there is no one perfect product, if one addresses the problem, most EMI problems will fade. I doubt you would go wrong with any of these but do understand you get what you pay for. So, don't expect a $200 power strip to equal these EMI dreadnoughts! Given what I have seen here, I'd say buy one of these and forget about EMI issues.
Case in point - a number of years back I was working for a very large, well known test equipment company, of which I am sure everyone knows the name. We were pushing the bandwidth limits a standard FR4 controlled impedance PCBA could manage, so we made a test board with exactly a 50 Ohm line, a line with 10% error, a line with 30% error, a line with 50% error, and a line with no controlled impedance whatsoever. What we found was even the 50% error line had reasonable performance while the one with no control was not usable. If you address the problem, even with error, you are far ahead of the game than ignoring it.
One of the nice benefits from these units is they monitor the line and shut down during long term brownouts or over voltage conditions. The utility companies have specifications on this sort of thing, call "ride through" where the user equipment can ride through the brownout or surge without self destructing. Back when I worked in audio, I knew a few audio companies tested their products for this but I doubt the majority do. The idea is products have a given ride through while the utility companies work to prevent problems that exceed the general ride through spec.
I didn't look at the regenerative products such as the big ones from PS Audio. These are an entirely different animal since your system is now powered from the power supply / amplifier / inverter contained within. The grid becomes secondary and not really in the picture. Unless you have horrible line regulation, you probably don't need to go to this extreme.
One thing is for sure, I would definitely spend $400 or $500 on EMI filtering and surge protection before I would spend $400 or $500 on spiffy line cords. Ignoring the awesome cosmetic improvements they provide, this equipment is very real and very effective. On the other hand, if you want really spiffy and sexy looking power distribution after you buy one of these ..... :-)