Our starting SOP is to first consider the apron surface under and in the immediate vicinity of the prop blades. When the surface is covered by lose stones, the props are set to full increase for the start to minimise the chances of stone damage to the blades.
Other than that, always start with the props in feather. This also has a practical application on a busy apron as there's invariably another aircraft - usually another Kingair - parked directly behind.