I guess Essjay had given you all the answers.
Since you will be quarantining the plants, I think it should be fine.
If you quarantine them for 1 week, if there are ich(white spot) parasites, they will die after 1 week without a host/fish.
There are people who will quarantine the plants for 4 weeks to ensure no parasites survive.
But I guess it's not necessary to quarantine so long.
Also, during the quarantine period, just remove the snails if you don't want them though as Essjay mentioned, they still have some use.
But I personally I don't like snails. LOL