The Expert Reviews website is one that I thoroughly trust, as it's run by the publishers of well-respected magazines such as Computer Act!ve and PC Pro, as well as highly-regarded websites such as TechRadar and Tom'sGuide.
As those titles might suggest, I usually turn to Expert Reviews when seeking recommendations in the field of technology but they also cover other fields, including that of 'home and garden'. I thoroughly commend their website to you, as a totally trustworthy source of genuinely independent advice:
https://www.expertreviews.co.uk/diy-tools/1413795/best-carpet-underlay