From my experience either way will work. Those little pieces will fall off just barely touching them so be careful. One year around my potting bench area where the babies had fallen off I had little burro's starting all over the place in the soil where I washed the debris. So they will start with noooo problem. I would stick a few stems in and then the babies that fall off just push them in the top of the soil all around the pot....wha~la burro basket done.
The only other suggestion I would make is to
plant them in a container you would like to keep them in for the life of that pot....and at a good height. They love to drape and will get very long. They do not like to be moved and as you pointed out will drop those babies everywhere if moved.
If for some reason your's don't make it let me know and I will send you some more.
Catlover