If I configure a table with “Bottom new row button” disabled, I don’t see the blue + (add) button in the iPhone app, even though “Above new row button” is enabled for the header.
Enabeling “Bottom new row button” ensures that the button is shown on mobile, but visually it appears in the header on mobile and not at the bottom like on desktop.
For consistency between desktop and mobile I think mobile should use “Above new row button” instead, or both.