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So a trap like the "Empowered Disintegration Trap" from the SRD uses its own perception to target foes, lets just say the rogue stumbles around the corner into a long corridor with a sinister disintegration trap at the far end (Max range of true seeing 120'.)
Lets suppose the Rogue has his trap sense, does he make his perception check DC 33 against the first square that could be targeted in the corridor, or against the trap some 120' away, (at a +12 DC.)
Considering a like Rogue of appropriate level for that trap will be ~level 16, so have a bonus to perception checks of +27-30 (16+8+3+Wis). Making the 33 quite an easy feat, and the 45 less so.
To make matters worse, if the corridor is unlit and the rogue doesn't have darkvision 120' would that provide the trap total concealment against the rogue jacking the DC by 40 (invisible/not moving?)
Does that all make sense?
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I think your correct on your math, which makes sense, butI have no experience with this trap.
If the trap ses him and then shoots a ray or something at him to kill him, Id say he would need to make the check at the far end of the wall, not for how far it could possibly shoot. However, if the trap on the wall somehow triggers the floor panel right in front of him to kill him somehow, then he'd check vs the both. Good enough for the floor panel lets him know not to step on that square. Good enough vs the wall part lets him know what it would have done to him if he had stepped.
In soviet russia, trap finds you!