double noun possessives [closed]

I'm writing a poem referring to humans as landlords of this planet.

Which is correct:

"they come to test this planet landlord's heart"

or

"they come to test this planet's landlord's heart"

I would use the first one for what I consider better style. Not sure it is correct.

I'm writing a poem referring to humans as landlords of this planet.

Which is correct:

"they come to test this planet landlord's heart"

or

"they come to test this planet's landlord's heart"

Answer: None of the above.

Humans are plural so the correct version is:

"They come to test this planet's landlords' heart." [Note position of the second apostrophe.]

or, if you think hearts should be plural:

"They come to test this planet's landlords' hearts."

"they come to test this planet landlord's heart"

This implies there are other planet landlords (whose hearts may or may not be tested).

"they come to test this planet's landlord's heart"

More scientific; we are dealing only with this planet and this planet's landlord.