How do I install the trays in a lazy Susan?

Before the counter top is installed

Each lazy susan trays , comes with its own hardware , the only thing you need to do is to look for the center of the cabinet mark it bottom and up of the cab , mark and screw it down according to the characteristics of the lazy susan and the instructions . if you need help with you installing ,you can contact to the technical support of this company. Thanks.

That's a Rev a shelf item. Info should be available on their website.

Depends on what kind you have