Vantr NFT platform will allow listing in both.  The choice of listing in Crypto or Fiat or both, is left to the asset owner.  However, you might have to consider the disadvantages of not listing in Crypto.  The Collector community that deals only in crypto may not consider buying anything outside of crypto as they incur conversion costs (Crypto to Fiat) in buying the NFT.  So you might miss out on the huge Crypto collector market by not listing in Crypto.