Tv wall mount help

[hardcore_gamer99]

As i need more space for my subwoofer pb 2000 pro i would be mounting the tv on wall now. As i have my dali fronts to the left and right of tv and their height from bottom is 42inches. My question is Can i wall mount the tv higher say tv bottom start from 43 inches from bottom so that my dali speakers dont cut the screen or it will strain my eyes or worsen the video quality? I would go with tilt height adjustable mount. I have 3 options. As i am having some null in bass frequency range75-80hz i can try all 3 walls IF BASS null can be treated if i change my wall?
1st is my current position here tv is on tv unit but here both sides have wooden gates and i am having bass null in 75 to 80hz range frequency.
2nd option is this and it has concrete wall to left but has wooden gate to right and will have small window and in wall wardrobe opposite to tv wall where i will sit.
3rd option is this wall it has concrete wall to right but has wooden wardrobe in wall.
I want to try all these 3 walls just because of bass null if in any case these wardrobe or gate opening to right of wall can cause null in subwoofer bass or does not matter?
If on all 3 walls bass will have same issue i would like to have it mounted on my current position which is 1st but it has gates both sides. what do you suggest? And how maximum high the bottom of tv should be if eye level in chair is 42 inches

 

[sbg]

Usually I go for TV position first - eye level at the center of the TV from appropriate distance as possible.
else I'm looking at neck sprains , drowsy eye as experienced over the years.

 

[hardcore_gamer99]

Usually I go for TV position first - eye level at the center of the TV from appropriate distance as possible.
else I'm looking at neck sprains , drowsy eye as experienced over the years.

Then i guess will have go same height as it is now on tv unit