No it won't be in the middle of the image. Although the watermark placement will move every render. Take a look at the FAQ on the page of the link I gave you ^^^.
It answers most of these questions you are asking.
pffft! since when did autodesk buy out maya as well as 3dsmax? it's ridiculous, they own pretty much every single program used in professional 3d modelling, and CAD work.