Yu can have as many dns servers in ispconfig as you want, just indtall all additional servers in the exact same way as described in the multiserver guide you posted the link for. The error message is abou the local mysql database contains already some tables, so its not about the remote database on the master. Each dns node has to run its own local mysql sdrver on localhost and you have to provide in the ispconfig installer the login details and a database name for a new database that the installer will create locally on the server to cache data of the master server.
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