Terraria / 2D based building system

Hi, all.
I’m looking to acheive a Terraria like building system on a 2D game I am working on. However, I can’t find any good tutorials or any help on this topic, not sure why honestly. Anyway, I want it to be in a 3x3 grid lining up with pre-existing terrain that I have generated using Perlin Noise.

So, would anyone know how I could achieve this?

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