The worst place to go in "VRS, is when you make a "vertical approach" in a small/confined area : You don't have any escape if the Vortex Happen
You have to be really aware at your rate of descent all time, but with a low flying speed : Above 300 ft/min, you enter in the Vortex zone, under 300 ft/min, no problem....So if in "ANY " case you maintain your rate of descent below 300 ft/min, you never risq to go in VRS..