tightvnc server configuration multiple monitors

Configuring with xrandr seems to be key but I can't seem to figure out the prerequisite steps when invoking the VNC server. I figure there must be something I'm missing.

If I VNC into a session set up this way, I still only see screen 0 (on output 'VNC-0'). I have tried specifying multiple screens on the vncserver command-line with -screen and then using xrandr to try and place 'VNC-1' next to 'VNC-0', but it keeps reporting that the output named 'VNC-1' is not found, even though if I query xrandr with -screen 1 it shows a display connected to it. The servers exist on a rack and are headless, so there's no unused physical adapters that I can repurpose as virtual monitors for VNC. I can't use nf to create multiple adapters, as I don't have root (and we don't have system-wide nf files anyway). I've looked around online and have seen mention of people being able to do this, but no real tutorials or lists of switches to pass in order to make it happen. But to the TightVNC Viewer, it would just appear as a single wide display. They can be stitched together into a single viewport but I don't want my Fluxbox taskbar or maximized windows spanning across the whole screen, as when I just double the horizontal resolution. What I would like to be able to do is set up the server so that it will create a session that has two separate monitors. I can set up the TightVNC server for my session as I feel appropriate. I'm connecting from a dual-monitor Windows system on my desk. They enable us to use VNC so that we can get a persistent desktop environment for ease of workflow. We have a cluster of Linux servers set up for us to log into via SSH to do our work. I use VNC at the office for the vast majority of my work.

Tightvnc server configuration multiple monitors