You need to make multiple installs, and then bind the DIFFERENT port for every server, from their soldat.ini's.
At least it looks like that you are trying to run many instances of the ONE installation, and thus you are trying to make multiple servers for same port, thats why the "Could not bind socket. Address and port are already in use.".
So, just install something like:
/servers/solserver0/
/servers/solserver1/
/servers/solserver2/
/servers/solserver3/
and so on, then configure every of them to different ports, like 23070, 23071, 23072, 23073...
This should fix the issue.