This seems like a good time to talk about "tilt and pop" since I just posted about the Sandwich #2. I like to center all of my students' hands around the 3rd finger. If you do this, you will have to pull back towards the scroll a bit to place a low first finger (B flat on A string, for example).

I often see students very gracefully reach back for the low 1, but then forget to let their hand come back into the "normal" place once they're done playing the low 1. Here is a song that I use to practice the "tilt" followed by the "pop".