It's all personal preference.
I feed in the enclosure with no ill effects.
A little bit of bedding won't hurt the snake. They are digesting nails and bones after all....
Some people will have a separate feeding container. I personally think it causes unnecessary stress. And as someone with more than a few snakes, feeding each one in a separate container isn't efficient at all. For someone with one or two snakes, it probably doesn't really matter though.
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