Since it was my first wall mount, I am inferior to the following error: Not those plate with large openings (the product photo on the left) is mounted on the TV, but the plate with small cut-outs and 2 vertical rails will be fixed on the TV back.
This (46Zoll Samung LED TV) were with my device which slots for USB, TV-Cable, HDMI, etc. from the thick metal frame mostly hidden!
My recommendation is therefore to buy a wall mount with the largest possible cut-outs in the TV bracket (Incidentally, there are also from the same manufacturer).