Findings - OS installation, installation of driver using Additional Drivers, installation of driver using the command line:
As indicated, during initial installation of the OS, one monitor was not provided a signal by the adapter. Although disconcerting, this did not keep me from completing the installation. However, when rebooted the adapter was still not providing a signal to one monitor. This being the case, I did not attempt to do any performance testing, and moved on to installation of the proprietary driver.
Installation using the Additional Drivers method was unremarkable.
Installation using the terminal was unremarkable.