HM=Haunted Mansion? A huge what?
Have you ever seen a Rat talk, and cook food? That's fantasy as well.(On a side note, a Ratatouille ride would be awesome IMO). This could fit pretty well if it's well executed.
Haunted Mansion doesn't belong in Fantasyland and it's a huge ":veryconfu" or question mark as to why it is placed there.
I think the Fantasyland rule ultimately stems from DL's Fantasyland and how Walt only wanted Disney characters present there which were the characters from his animated movies.
Also, 20k was in MK's FLand which might of broke that rule but that was a Walt creation so idk lol