Camera settings to fake iso/ortho cam in perspective so that SSR works?

So I originally used an orthographic camera and the mirrorShader4 to achieve what I was wanting, but I ended up wanting falloff on the reflections. Since I suck with shaders and didn't know how I could introduce falloff vertically to a camera, I tried to fake the falloff with volumetric fog that was hidden from the main camera and visible to the camera used by the mirrorShader. Didn't have much luck in getting things looking right. I eventually ran across Unity's SSR and threw that into the scene but quickly found out it requires the deferred rending path which meant I couldn't use the orthographic setting on the camera anymore. So I'm looking for help with either camera settings that would get me as close as possible to an isometric view using the perspective camera or if someone knows of a mirror shader/script that has a falloff setting or even another option... I'm open to suggestions.