It doesn't matter: do whichever works best for you. Don't let it become a matter that you consciously concentrate on. Notice the four corners and a kind of "X" between them, or notice the blip.
By the way PhotoReading changes one's perspective on reading. Tonight I activated three books according to my need for them, and I felt like I should have done more. Reading in the regular way, or even speed reading, would certainly not have resulted in being quite finished with three books, with nice note-maps one per book showing the author's best points. Three books a night would not have been 'slow' before!