Remove the tray table from the GLADOM top and set aside.
Then I bore holes in the GLADOM table frame with a drill and 5 mm bit at 6 cm from each leg.
I drilled a Q-box which I got from Facility Italia (with customizable drawer front image). These drill holes must correspond with the holes drilled into the GLADOM tray table so you can secure the drawers onto the frame.
I attached the drawers to the GLADOM frame with 4 hex nuts and 4 screws.