I recommend not using prerendered Backgrounds alá Resident Evil, Dino Crisis, Final Fantasy 7 etc.
The Backgrounds in these games have Z information for overlaps when 3D Objects are further away.Splitting the backgrounds into several layers need a lot of practice, because you have to find the rigth Z Values for this.
The backgrounds also don’t scale. If you have a higher Resolution than the Background you’ll see scaling artifacts. Also what happens if you want to change the environment a bit because you found a bug? You need to change several backgrounds that include this area (e.g. multiple cameras show the same area)
I recommend using a standard Level with 3D Objects and fixed cameras instead. It’s much easier to adjust.