I've had better luck leaving them as long as possible then just poking them into the ground by the plant than anything else. Most of them are small but if they get some roots out they seem to survive.
I posted in one of the other threads about putting rooting hormone on the base of the prolif and providing some soil to start root growth. This actually worked pretty well and that prolif, now in a pot with the mother plant is growing like nothing happened.
FWIW the biggest prolif I have ever had was on a plant that Michele sent earlier this year.