The picture says it more clearly than I can. It’s easier to read if the tima’s are lined up one way or another.
The famous book Pumping Nylon has r.h. notations paralleling the beams in some instances, and in others they line them up horizontally no matter what. Paralleling the beams and stem tops is fine. Horizontal is great for when you are focusing on canned fingering patterns.
Two options I would like for r.h. notation placement would be “Note top aligned” (doesn’t care about stem direction), and “Horizontal”. Personally I would altogether avoid placing r.h. notations some above and some below the staff, but YMMV.