My use case is tightly related to how autossh operates.
In autossh you specify a port that the software uses for monitoring the ssh connection (I don't know the internals).
Since I am going to have more than one connection, I need to specify different numbers for each remote call.
For example, normally you would do autossh -M 20000 HOST sleep 60, but if you wanted to have other parallel calls to the same host you would probably to call them autossh -M 20001 HOST sleep 60, autossh -M 20002 HOST sleep 60, ...
My idea was to call parallel as follows: