There are different overlays that will put your text in different areas of
the screen.
Explore the different overlays until you find the one that works for you.
There is no way to do that without creating your own custom XML transition
which is why I suggested to explore the overlays available.
Typewriter is across the top basically. Ticker tape or subtitle are on the
bottom. Basic Title is in the center.
Basically that's what you've got generically with WMM without creating your
own or downloading one from the net.