It is not the easiest way to sex them looking from above. I prefer to vent them to be sure. Some of the best pleco folks I know, oones who taught me, have had problems with sexing zebras.
From above, and without better resolution and not pictures from the side or their undrside, here is my best guess. I could be very wrong.
1. Likely male
2. Likely female
3. Likely male
4. Not sure could go either way
5. Maybe female
6. Likely female
7. Likely female
8. Likely female
10. Probably male
Now I am probably wrong because you are female heavy which is not all that common. The ideal ratio is 2 males/1 female. I cant tell as accurately, or moreso, from behavior than pictures from above. I would bet I have a few of the ones I call female wrong as there should normally not be that many in a random group.
In general:
Male has a pointier head and females a more rounded one
Males get more prominent odontiles on their cheeks and on the front edge of their pectorals
Females tend to have a wider body behind the head and males are more streamlined.
Most males have a black dot at the point where the tube is out.
Males will claim cave while females mau use them, especially to overnight, but they do not claim them.
Have a look here
https://www.zebrapleco.com/core/hypancistrus_species_info.php
and here
https://www.planetcatfish.com/common/species.php?species_id=168
