How close can villager plot facing a cliff/river?

[Ably.Saucey]

Hi all, I'm trying to plot reset Ken and it low key bugs be that he's not lined up with 2 other houses.
I know they can be 1 space away on sides and back but how's the front?
Thanks!

 

[Loriii]

2 spaces in front of cliff/river.

 

[Ably.Saucey]

2 spaces in front of cliff/river.

Fantastic! Thank you!