That is sweet. For some reason, I thought about them being flat mounted. Much better of an idea... Nice!
I have multiple monitors too, but not that big. Unfortunately, my laptop (which comes with this job) doesn't allow me to use the software I used to extend my tray across both monitors and have to goof with my desktop size to extend it across the two monitors I have now. I had 3 monitors on my old desk and it was cool to see what was running at the bottom of each monitor instead of having everything dumped in the single tray in the first monitor. I could have 10-20 windows open at a time at my old job. I used UltraMon. It was pretty sweet and worked with the Nvidia card that my PC was running. It was worth the $ I paid for it out of my own pocket just to keep everything "visible" in the tray.