I use an ice cream bowl; a 1ltr oval plastic bowl or a round plastic cereal bowl (about 15cm in diameter). Put in about 2cm of new, clean 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 to reduce bacterial growth (not secured - so it's easy to take off without disturbing the eggs).
I don't need heaters (I live in a tropical area). If temps are low and unstable 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). Then I cover the whole tank to reduce debris getting into the bowl.
After 24-48 hours, they begin to hatch. I pick up the rotten eggs with a small stick like a tooth pick (you could use tweezers). 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. I also add a common pond snail to eat rotten eggs I can’t pick up and later, uneaten egg yolk.
Sometimes I feed a drop of eggyolk once they’re free swimming. 1-2 days later, I acclimate them 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.