Wow, this “behind the office chair” TrackIR camera holder is almost a thing now. 
Props to Velcro for developing some great products!
Rear view of my office chair back …
Front view of my office chair back with the TrackIR cam peeking over and my filthy fireplace …
That’s cool - my initial thought would be that it would be too close to your head there, obviously not!
So you have the trackclip on the back of your head? Interesting way of doing it. You find it works better, obviously?
When using a big monitor, the angle between the sensor and the LED clip increases, because of the sheer distance of the monitor edges, to its center.
I found that this was a problem already on a 34” monitor. Placing the sensor behind you, turning the LED clip around and inverting some axes, puts everything back in line.
