Are wet-food automatic feeders actually safe?

Across apartmenttherapy.com coverage, cats.com, and r/CatAdvice discussion, semiconductor-cooled feeders (like the PETLIBRO Polar) keep canned food at safe temps for roughly 24–72 hours depending on how many compartments you load. Reviewers caution that ice-pack-only designs (like the UBPET) don't hold temperature as long, and that wet-food feeders demand frequent cleaning regardless of brand.