I prefer a taller window. Started carry optics years ago with a vortex venom, it was wide and short. Switched to a FF3 which was narrower but taller.
When I started out it seemed that my aim was usually low, left or right didn’t seem to be a problem. After a bunch of practice and a year of matches the dot is in the center of the glass. This will come as you practice drawing and getting muscle memory built.
Now I use a DPP.