If the area they were laid in is a bit on the dry side, you can carefully remove the clutches, being careful not to crush them. A sharp knife blade slipped between the clutch and whatever they are on works.
Then get a two cup size deli container with a lid, nice and clean. Damp paper towel in the bottom, then something to prevent the eggs from contacting the paper. Place the clutch on the support. Poke a few holes in the lid, put it on, then float the container in the tank, where the water will maintain a reasonable temperature, and the container will provide good humidity. If you see condensation on the inside of the container, poke more holes, you don't want eggs being wet.
Once you see signs of hatching, move the little snails into the tank right away, toss the left over mass and any eggs that failed to hatch.
Not all clutches are fertilized, so they can be duds. If they have not hatched in a month, likely they are not going to.