I agree with Nanshork...
The traps with the "Location" trigger type are, well, triggered by stepping on a particular square, but there's nothing in the rules stating that the same trap can't be triggered by other means, or, in other words, the same trap can very well have multiple triggers. That includes, but doesn't limit to, levers/buttons in a guard room nearby.
As a simple example, most glyphs may be considered both "Proximity" and "Spell" triggered traps.