Moveable 3D Map on a table/Clipping/Shaders?

I have a city type mash that I want to display on a table. The user should also be able to move/rotate and zoom that "map".

Now I am wondering how to go about this. I searched for a good while and a found a few solutions using clipping shaders. My problem is that I haven't wrapped my head around shaders yet and all the solutions I did find were pretty old (Unity 3), so they didn't work for me in most recent version.... plus they all only seemed to support only one plane to clip, where I would need 4.

Any ideas?