The phrase "are mostly renowned" is correct and usable in written English.
It can be used to describe something or someone that is widely recognized or famous, with an emphasis on the majority of people acknowledging this reputation.
Example: "The artists in this gallery are mostly renowned for their innovative techniques and unique styles."
Alternatives: "are largely celebrated" or "are primarily known".
Despite their beneficial ecological contributions, muscid flies are mostly renowned for their medical, veterinary, and agricultural pests, which include the house fly, Musca domestica Linnaeus, the stable fly, Stomoxys calcitrans (Linnaeus), and various shoot flies of the genus Atherigona.
Maybe we should put it down to nervous tension, though George was mostly renowned for his calm, phlegmatic temperament.
Although Crichton is mostly renowned for his work as a novelist, he also wrote and directed several motion pictures.
Sports Illustrated's Peter King, the trade's current big dog, is mostly renowned for drinking coffee and pulling Sunday all-nighters for his weekly column, but is a magnet for information and access, and it comes across, Starbucks worship notwithstanding.
Although John Snow is best known now for his work on cholera, during his lifetime he was mostly renowned as an anesthesiologist; he was the personal anesthetist to Queen Victoria during delivery of a number of her children.
Yunnan province is renowned for three kingdoms of plants, animal, and nonferrous metals, parallel evolution of crop adaptation to nonferrous metals, and anticancer foods for human being are mostly cultivated in this region.
Situated in the upper Amazon, a region mostly renowned for leeches the size of terriers, the lodge proved to be a refined and, almost disappointingly, comfortable retreat.
Another early UFO organization, whose members were mostly military, was the National Investigations Committee on Aerial Phenomena (NICAP) founded by renowned physicist Thomas Townsend Brown in 1956.
Vermont is renowned for its cheese, but for artist Sam Raines it's mostly about the cows.
The most renowned pontifical statuary — by the likes of Michelangelo, Bernini or Canova — is mostly inside churches.
