For me it makes no sense to buy "costly" or even relatively costly power cord before addressing all the other factors:
cleaning the electrical grid of house and room,
Adressing the problem of mechanical resonance and vibrations, an underestimated one,
Treatment of the room and of speakers...
and even the search for the right source gear, or amplifier and speakers is mandatory in the first place because the power cord will not act the same in a different audio grid...
There is controversy with this subject, and all those in favor of only cheap cords, and those who vouch with costly one, are nor wrong neither right, this is their experience in a totally specific environment...
The power cord is the last think to buy like costly cables for your speakers or dac and amplifier...
Choose first the right gear for you, after that makes the three problems I speak of rightly answered...
After that spend money on cables and cords ( not too much tough) the reason is the impact of cable and cords is less , way less, than the right answers to all the other problems and choices...My best to all...