First question is: Do you have more than one mystery snail? They do require both a male and female for fertilized eggs. (I know you tend to do your research just asking as I was surprised to learn that)
And I would guess that the emersed setup would be perfect. Just make sure the eggs are not in the water. I cannot say from personal experience though. Just my 2cents.
And I would guess that the emersed setup would be perfect. Just make sure the eggs are not in the water. I cannot say from personal experience though. Just my 2cents.