TRELA does not require a second written consent. TRELA does require written notice of any appointments, and the written notice would probably cause any objection to be resolved at that point. A broker would not be prohibited from obtaining a second consent as a business practice, so that potential conflicts are identified and resolved. The earnest money contract, of course, would typically show the intermediary relationship in the Broker Information and Ratification of Fee section of the contract.
Source: TAR