There are a number of ways you could do this.
Keep in mind the basic principle: good, healthy, and fertilized eggs WILL hatch regardless of care. The problem might be keeping fungus off.
I use an ice cream bowl; a 1ltr oval plastic bowl or a round plastic cereal bowl (about 15cm in diameter). Put in about 1-2cm of water, carefully spoon the eggs into the bowl. Spread them as best I can - to avoid bad eggs ruining good eggs. (btw, eggs that have been picked up by the parents will float - IDKW). Then place the lid on top (not secured - so it's easy to take off without disturbing the eggs).
I don't need heaters. If temps are low and unstable (like now) I simply place it in a warm tank or place it my room. If you place it in a heated tank, make sure the bowl floats evenly (not tilt).
After 24-48 hours, they begin to hatch. I pick up the rotten eggs with a small stick like a tooth pick. Sometimes good eggs get caught in rotten eggs but will hatch so I don't immediately throw them away..... Then I slowly add 100% water to the previous water using a drip system ..... don't make the water drop. Make it "flow" from the side of the bowl. Hopefully this will reduce ammonia.
When they are free swimming, I acclimate to a grow out tank. Then release. The percentage of hatch depends on how good the eggs were in the first place. I've had 0% hatch. But have also had 100% hatch. My average is around 60%.
If all that is too troublesome, you could leave everything in the breeding tank - use lower water level (about 3" or so - actually this has little affect except it makes me feel better. LOL). Take out both parents when they're done spawning and hope for the best. ..... Good eggs will hatch. And strong fry will survive. But you might not get that many with this method, specially if you have tons of snails in there.