We have to agree with YZ the speakers need to be in front of you.
When we have had a similar room setup we find it disconcerting to have the sound source be coming from behind the listener
The brain wants to be organized with the body's orientation you are facing opposite the sounds direction that will be disorienting over the long term.
Your best bet placing speakers in front of you or getting a set of small speakers you can use on the desk.
Dave and Troy
Audio intellect NJ