How to get a camera position similar to Wii Play "Tanks!"?

I don’t know if this is the right place to ask this, but I started making a roguelike tank game inspired by Tanks!, and I can’t figure out how to position the camera so that it’s both at a <90-degree angle and have the walls straight, like here: http://imgur.com/a/WVaaezD.

Ok, so after a little more looking around, I realised that the view was an orthographic view, so all I needed to do was set the camera to orthographic rather than have a really low FOV and have it reeeaaally far away