What to do with Agave vilmoriniana bulblets

My biggest Agave vilmoriniana threw up a tall flower stalk that is now covered with bulblets that I'd love to root.
Im always torn between just wanting to lay the flowering stalk onto the ground and letting them root in place, or picking the baby plants off the stalk and trying to get them to root in a flat. So far, I've tried both with A. attenuata and not been successful either way. And when you start out with a couple hundred plant babies but not had a single success, something is truly wrong!!! 

I'd would appreciate any advice anyone has to offer about
best methods
best timing
best rooting medium
how long they may take to root
etc.

Thanks!
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