I actually try to distribute my weight evenly, giving me a fuller shape as putting myself in a stack would not fill the total confines of my human suit, ruining my disguise :]
I set my name on a Discord server to "9 rats in a trench coat" and when a friend asked I said "because im not big enough to be 10, but not small enough to be 8".
Anyway, turns out I really AM about 9 rats tall if we are to assume the rats are all the same height (somewhere between 6-8 inches which google says is a rats average height) and assuming that I did the math right.