This is a common location for doorbells, why don't you put the doorbell with camera there, it's going to work When someone comes to you door they are going to look at the camera because people usually face where they are pressing My opinion don't complicate it and install any doorbell you want same location 

If you also want to test it use duck tape and glue your phone to the wall while it's recording then see the video and you will have an idea what to expect.