How tall do you like your images?

It is also worth mentioning here the depth of the image on the stage, depending on the space behind the speakers and the size of the room. In any case, you can resort to the installation of diffusion plates, either on the front or rear wall, it all depends if you want advanced or delayed, if it is a 2-channel or a multi-channel.

Floor-to-ceiling like Bob Carver's $15K Line Source system from some years ago! 

Or a pair of the nine-foot Acoustat 1 + 1's!

Worst speakers for image height are the Klipsch Heresy's. I am glad I sold my pair!

Also agree with Mike Lavigne on height being system dependent. Especially with tracks / albums with a deeper soundstage alike Muddy Waters Folk Singer, I appreciate that the stage is not tall because it accurately portrays a stage that is deep beyond the speakers. That said I do resonate when a performance is close with the vocalists at standing height.