Normally, a freestanding stone resin bathtub will be installed with pop up drain and a popular drain set is like below image shows
Bronze body with Ni or Chrome plated surface, the cover of drain head can be changed to acrylic solid surface(same material as tub body) like the below image shows, which will make tubs looks like a whole stone piece
The hoses connected to drain head normally has two kinds, Normal PVC hose and Anti odor hose
To install a Anti Odor hose, the bathtub bottom should be at least 10cm from the ground to leave enough space for such a hose
Why it is anti odor? Due to a fully filled water storage container is equipped which can block odor go through drain pipe