The easiest thing Ive found is to take a sharp blade, to cut off the plastic slot, and then using a small drill to put a hole into the feet and then into the base or terrain on the base. Using even a small piece of wire doing even small amount of pinning to give strength to the models.
personally ive only used this technique on some of the older ork models, which still had the slotted bases, this may be problematic, particularly for the cavalry models as suggested due to the thinner legs, but still another option.
personally ive only used this technique on some of the older ork models, which still had the slotted bases, this may be problematic, particularly for the cavalry models as suggested due to the thinner legs, but still another option.