Follow this example for the caraone.json file. In a lot of workflows, not mounting the proxy and thumbnail can make a cleaner and faster installation. Essentially you double up the \ in the path. The example has "X.X.X.X" for the IP address of the server. Set the appropriate IP address and UNC paths for your environment.
"Server": {
"UserID": "nab20241",
"EncodeBackendURI": "http://X.X.X.X:9091",
"ProxyPath": "\\\\X.X.X.X\\Proxy",
"ThumbnailPath": "\\\\X.X.X.X\\Proxy\\thumbnails1",
"MediaPath": "/Volumes/MyDir/",
"IndexingTimeout": 2.0
},