The Content Installer documents are missing some options for a silent install. Here is a working install that installs everything, including the reports, on multiple appservers.
Put the above into a file, eg silent.txt and run it like:
./Content-<OS>.bin -i silent -DOPTIONS_FILE=silent.txt
change the true to false to not install something.
The USER_ACCOUNT_PASSWORD was generated by running 'blenc'. I also has established credentials using blcred but it's not clear if that's required or not.