ETL wont start with multiple screen devices
Currently r_mode 2 selects kind of 'native’ screen resolution which might be the total reolution of all screen devices
See console output of forum post: 3 monitors with 1920x1080 native resolution are creating a 5760x1080 resolution.
In case of multiple screen devices use and set screen related cvar values for the device with poorest resolution
or get the primary device (if possible) and use this.