I'm creating a giant wasp hive in the boughs of a tree in the Feywild, and it happens to have a boggle in it.
The upper sections of the hive have smaller, narrow, rigid, doorway-type openings everywhere that the boggle can use for dimension shifts.
My concern is about the bottom two sections of the hive. The doorway-type openings throughout the bottom two sections are ten or twenty feet square on those levels (so, 15'x20' or 20'x20' or whatever).
I'm concerned that these openings might be too big for the Boggle's dimensional rifts. How large/small of an opening does a boggle need to use this ability?