Feed inside the enclosure. There are absolutely zero benefits of using a feeding tub.
Feeding in a separate tub
A) increases chances of a refusal due to stressing the snake prior to feeding
B) increases the chance of the snake regurgitating it's meal due to being moved and stressed after eating
C) increases the chance of you getting tagged, since the snake is still in feed mode when you try to move it back
The "food aggression" thing is a myth, proven false over years with thousands of animals.
I have NEVER been tagged inside any of my snake's enclosures. Never even struck at. I HAVE been tagged outside the enclosure.
If you're concerned with substrate impaction:
a) nobody cleans their food in the wild
b) if you're still concerned, lay a paper plate or cardboard down (not paper towel) even though the snake will likely drag the prey wherever it wants.
