Depends what is clockwise and what is normal
in any case yes, it should be on leading edge, but its function is not "several small vortexes instead of one big vortex in tip", the function is to make 1/ higher speed at LE and thus reaching higher RE number and 2/ make little bit spanwise crossleading flow just like VG or zigzag turbulators does and so make some attached turbulence and so keep flow attached
Unfortunately it is not copletaly clear HWERE flow separates on our props, electric motors give chance to hear sound of prop and thus optimize it, but I am sure that some props separates on upper side at large spippage while others make bubble at LE wit low or negative slippage (while braking), depending on airfoil shape ... it is very easy to hear, if it makes stronger noise after corner while climbing, it separates on top, if it makes that sound while diving, it separates at LE on lower side.
IC engines are noisy, but anyway, I remember that effect with piped low pitch props while diving or on bottoms of figures. I also think that buble helps to brake the prop and not to allow overrewing (I wrote it somewhere some X0 years ago :-P .. may be even on compuserve), so it could be even countereffective, I think it is better to think also what it does aerodynamically then to solve only sound :- ))