Does anyone know how to place the piece on the floor, in keyshot, and solidwork2018

In solidworks, you need to 'edit scene', (right click, edit scene) and select geometry or a reference plane to align the floor to.

In Keyshot there is a Snap to floor option in the scene manager. Sometimes it does not work, and you'll need to use the Move triad thingy to manually drag the part down to the floor.

I think there is also an option to snap to floor, and center in scene when importing a model.