You may need some other consultants, like geotech engineer (soils report), site lighting engineer, etc. 

Every Google answer I found was it shouldn’t be done because it can contaminate the soils and groundwater.

I buy mobile homes in parks where I own the land underneath the trailer. 

E.g. fire rated construction requirements on main homes, survey & soils reports, utility upgrades. 

If water does get into the seams and underneath it it is a big PITA.I would definitely leave the tile where you have it, because it is much more durable.

I would also explore how much work it would be to move that white cabinet from the left side to the right side including replacing the floor underneath because it probably is not vinyl.

At a minimum, it needs to stay dry, which means getting any standing water out (sump pump and french drain), ventilation (moving air will dry out excess humidity), and a vapor barrier over the soil.

We tore up carpet this past weekend and while the hardwood underneath looks good, the previous owners used not only tack strips, but also decided to staple the carpet padding directly to the hardwood in "rows" throughout the floor.

The specific location ( 4' * 6' long) is underneath a guest bedroom window in the front of the house. 

They are financial nightmares and very challenging to repair and replace the roof underneath.