Is it permissible for more than one guardian of the deceased to share in fasting for an atonement oath or in fasting Ramadan on behalf of the deceased, such that they divide the days among themselves?

If a person dies and has fasts due upon him, it is permissible for his guardian to fast on his behalf, whether it was a fast of vow or otherwise, based on the hadith of Aisha: "Whoever dies with fasts due upon him, his guardian should fast on his behalf." If the deceased owes many days, it is permissible for his guardians to fast on his behalf for the number of those days, even if they fast on a single day or divide the fasting among themselves, provided that the fast is not one that requires continuous observance, such as the expiation for ẓihār. Otherwise, a single guardian should fast on his behalf or they should feed a poor person for each day.