Show gridlines for additional lagoons/aviaries when building one

I am getting really frustrated building aviaries and lagoons as when I want to put the addition on it isn't where I think and therefore I am to close to an edge, or too close to a building.

I think having a grid when you are building so you can see where the future modules would be and if the game will let you build an addition. I don't find the arrows very helpful.
 
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