In the second article, it is instructed to place the stamp on the upper right of the address side, but no reason is given other than facilitating processing. Just like England. The reason may simply be to be consistent with the way it was done in England.
Now, knowing the information of both articles, I am incensed. The unfairness to left handed people has been completely disregarded in the entire history of postage.
I think all countries should begin releasing left handed stamps, and without delay.

-IBFS