I've heard back and forth over if prekilled is the way to go for the same reasons snakes are recommended to eat prekilled (no risk of prey fighting back). That and with the likes of meal/superworms there's no worry they'll escape and bury into the substrate if they're already dead, for example one time I dropped a live superworm for my A. seemanni and it nearly disappeared before she managed to dig it out. But on the other hand the better feeding responses I've had with live speak for themselves so.
In regards to putting prey on webbing, that's worked fine for my C. versicolor who made a web "platform" not long after coming home, but as I've come to find out, A. germani just, don't web, at all. They're behaviorally more like an arboreal wolf spider than what you'd expect of a tarantula from what I can tell.