I read this interesting article which talks about the Gutenberg principle of a terminal area as being the most appropriate location to place a call to action button to enhance conversions.Simply put
The terminal area is the bottom right area of your home page focal point. It comes from the Gutenberg diagram, an age-old concept developed by Edmund C. Arnold. It’s commonly used to optimize displays that have a limited number of elements. It divides your display into four areas. The primary optical area is at the top left, the strong fallow area at the top right, the weak fallow area at the bottom left, and the terminal area at the bottom right. The user’s eyes naturally begin at the primary optical area and move across and down the display in a series of sweeps to the terminal area.
Though I agree with it from the perspective of most users (lets exclude languages which read from right to left) reading from left to right and right being the final ending zone ,The lack of any A/B testing (in the article) makes me wonder how true this would be.
There is already an existing question on this which gave some good insights but I would like your views on this with regards to the theory posed by this study