Took a break from my main base building to build/make a visual guide - I like to hide my generators so figured this might help other people looking to do the same! This guide also doubles as a way to hide other single tile objects.
(Objects that didn't work were excluded from this guide.)
How to read:
Generators: Amount indicated total that can be placed behind object
Green Arrow Signs: Points toward hidden placement
Red Arrow Signs: Points toward exposed generator placement