A solid object in front of a speaker will have some effect on audio quality due to reflections. The smaller the object the less effect. There's really no way to predict whether or not it would be objectionable to any specific individual. The best course of action would be to try it and see what your ears tell you.
If you think there's enough of an impact on audio quality there are several options. You could raise the TV so a center speaker could fit immediately under it. You could add a shelf on top of the TV to place the center immediately above it. Or you could add a small extension in front of the center post to hold the center speaker in front of the obstruction.
If you think there's enough of an impact on audio quality there are several options. You could raise the TV so a center speaker could fit immediately under it. You could add a shelf on top of the TV to place the center immediately above it. Or you could add a small extension in front of the center post to hold the center speaker in front of the obstruction.