1. Under symbolism in Feng Shui, it is less than ideal to have a vertical joint-or-split-line exactly where the TV is mounted (which splits the TV exactly into half):-

The red line shows clearly the split:-

2. This is because a piece of Formica laminate has a maximum length and width. And most important is that there is no one large piece.

2.1. Therefore nowadays with the feature wall covering more than 4 feet by 8 feet, someone there will always a joint between two pieces of Formica laminate.

3. If so, insists on having vertical joint-lines as shown, below:- 

Hi Cecil, this is the TV console wall, there’s a horizontal middle line gap. That’s ok?

Yes, no choice. Horizontal line is preferred; anytime vs a middle vertical (line)