FreeRDP sends along the hostname of the client computer when it connects. Unfortunately, macOS doesn't seem to set $HOSTNAME by default. When I connect, I usually end up with (what I presume is) the name of some other computer who used my IP last.
This shows up in the "Users" tab of Task Manager as well as the friendly name of any mounted drives in Windows Explorer: "Documents on $client_name"
If TSX could use the output of `scutil --get` for ComputerName or LocalHostName, I believe it would be better than $HOSTNAME or `hostname`. I got around this with `scutil --set HostName foo`, but it'd be nice to have the right value straight out of the box, so to speak.
Good news, Michael! This will be supported in the next major release.