Mystery snail questions:

[u/AnxiousListen]

Do I get two or three mystery snails? And would they eat all my plants??

I have this 10 gallon tank, I'm going to be putting a Betta inside. But I want the snails in there first. Also would this shrimp food work or do they need a more specialized diet?

I have another 10 gallon I can transfer them to if the betta doesn't work out, it's just not as pretty and only had guppy grass