Outdoor - Override Mounting Height

Hi,

Below is a sample outdoor platform. The platforms were modelled as Floor Element. When I attached a luminaire to be mounted on a post, the mounting height changes to negative values which means it automatically detects the platforms as its reference point not the ground. The luminaire only has a default Ceiling mounting height. How do I reference the luminaire to the ground? or is there any method to override the mounting height? Also, when the platform is calculated, the layout plan shows the bottom luminaire.

Thank you.

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