放到 is a resultative verb compound meaning 'to put (something) to/toward (a location)'. The verb 放 (to put/place) combines with 到 (to arrive at) to indicate that the action of putting results in the object reaching a specific location. This structure is common in Chinese and often follows the pattern '把 + Object + 放到 + Location' to emphasize the handling of the object. It can also be used without 把 in a simple subject-verb-object-location order.