I suggest an experiment. Have a fermenter spooge all over the carpet and then try to clean it. Or just search for "how to get yeast gunk out of my carpet" and live vicariously through others. I recommend the latter. Ugh.
I'm in the always use a blow off - finagles law always applies.
As for container, I've always found a growler half full with star san does a damn good job, even if the fermenter is a gusher. I've had good luck putting the hose on the inside of a 3 piece airlock or one of the carboy tube hoods, but you *could* get blockage.
Oh, always have the blow-off container *below* the wort line of your fermenter. Suck back is a bitch. Suck back that triggers a siphon and slurps up 20 oz of liquid is a significantly larger bitch.
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