I've used this style of stud and haven't had the issues with them coming out. So, suggest the below for stud location (note the red dots). (Note if your boot sole is of a softer sole material, then expect to lose studs)

Suggested Stud Placements. If the boot doesn't have marked stud placements, put them between the cleats, (note the red dots below) and on the outside particularly on the front section, then you won't feel them pushing up under the ball of your foot. If you put them on top of the cleats, they'll give more grip, but they won't stay in very long.