如何根据画布外部的不同屏幕尺寸（非 UI 对象 – 实际游戏对象）缩放 Unity 引擎中的游戏对象？

 I want to consider the edges/borders of the screens and place the gameObject accordingly with sufficient padding across those edges/borders of screens. Also I have to keep the scale(x & y) equal. 
I have to prevent it from being bigger or smaller and getting out of the view or overlapping with other objects in the game scene. BTW it's a 2D game.

我尝试过的：

I have tried Camera.main.ScreenToWorldPoint but don't know how to guide it to get what I want. And I don't think it would be sufficient to do that.