Hi Grace87!
The best solution would probably be to put a mirror on your desk positioned so that you can see behind you. We've had several people here use that technique, as much of the office is cubicles and you can't always face one of your good directions without having your back to the doorway.
Ideally you don't want anyone coming up behind you without you being able to see them. It would also be good if you had a high backed chair so your back is protected when you are sitting at your desk.
All the best!
Wendy Greer
