When I tie in tails and want them to stay on top, I pinch the tailing material and the make the first loop of LOOSE and pinch that as well between my thumb & forefinger.
When I tighten that first loop of thread and subsequent others formed the same way, I pull the thread straight down on the opposite side of the hook tightening the loose loop while still pinched between my thumb & forefinger.
Wrapping this way versus just holding the material and wrapping normally keeps the thread from pulling the tailing material across the top of the hook shank.