What's the best approach on wall corners in a grid based building system?

When the North/South wall intersects the East/West one I end with 2 walls overlapping.
Possible solutions I thought so far:
1- Having a dedicated building part for corners (not fancy)
2- Having a “shorter” wall that can fit in that situation, this would be optimal but I can’t think of a reliable way to detect it’s an intersection.
Thoughts?

You could detect if two wall are overlapping ( a lot ), and place a sort of ‘corner pillar’ piece, which hides the join.

Hey thanks, that’s not really the problem.

Actually when my system detects overlapping it forbids item placement, otherwise player could place a wall where there is another already, just to mention an example.
I’m not sure if this is the right approach but it’s what came to my mind when I coded it.

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