Surround tilemap with spikes (2D) Help

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Surround tilemap with spikes (2D) Help

Fallstormdev

So in the game i'm currently working on there is a hard mode where all the surrounding terrain should become filled with spikes. How do I add spikes to every tile facing in the right direction of a Tilemap2D?

See this imgur with on the left no hard mode enabled and on the right with hard mode enabled

Cheers