TV mounting in Ajax is often a fight with the afternoon sun. Open family rooms in the newer north end have a wide bank of rear windows, and the glare decides the bracket as much as the wall does. A full-motion arm solves most of it.
I look at the room at the time of day you actually watch, then set the height from the couch. Cables get concealed inside the wall where there is a path for them. Free quote, price agreed first, and Monday to Saturday hours that suit most households.