Can a lightning cable plug get short circuited by a metal surface? I have a couple of lightning connectors on a flat surface, ready to plug into an iPhone or iPad for charging. At the same time, a Macbook or iPad is sometimes placed near that surface.

Can the body of the Macbook or iPad actually short circuit the lightning connector? (since their 4 pins are exposed), and have potential fire hazard at the adapter if it is the official Apple adapter or the popular Anker brand?
I do not think that that can happen: when you look carefully at the lightning connector you will see that the metal body of your mac will touch the upperside of the lightning connector which is one band only and not one of the contacts that are on the sides.