[StavrosK]

> Can you do that if it is dangling from a chain between two gate halves? Or would you bring out a bench and vise to your target?

I would just mount a clamp to the front of the Ramset gun.

> Is the drill able to be positioned in such a manner when the lock is installed on a door? It doesn't look like it.

It really looks like it to me, you need to drill the front of the door.