How tall do you like your images?

@christianb5s4

Depending on how your speakers are set up, it may also help to put standing panels between the speakers and the TV.

@christianb5s4  Unfortunately TV's are a difficult item to overcome.  If you can put it behind a movable curtain, that is ideal, otherwise compensate by making sure the rest of your room is treated well.  Treat the ceiling, diffuse behind the listener and to the sides of the speakers.

@mikelavigne 

Having the proper balance of direct and indirect arrivals is critical, and one reason why I feel most audiophiles don't use diffusion behind and to the sides of speakers enough.  Too many still focus on dampening alone and that creates a headphone effect devoid of depth.

My experience, BTW, is that not all speakers like to be toed in at all, but compromises for the side walls is often needed.

Also, the ideal height for some speakers is below the tweeter axis.  B&W often does this, some do this by accident.  Ear at tweeter axis / height is a starting point, the sweet spot is often below the  tweeter.

My experience with line and planar sources is that the height is actually wherever my ears are.  That is, if I am sitting the music seems to be right in front of me, and the same standing up. 

Compare to a traditional system where the image remains between the tweets.

Kind of an aside, the top of your PC monitor should be at eye level, so your body's natural ergonomics, to look down, is satisfied.