With zero clearance you can remove the legs of the adjustable base and place it directly on top of your bed frame. Please ensure the slats of the bed frame are strong enough to support the weight of the base, mattress and individuals sleeping on top.
Note in order for Premium Plus to lay flat in zero clearance, the motion sensor will need to be removed find instructions, HERE). Underbed lighting can still be turned on/off with remote and app, however the light may be obstructed by your bed frame.