The best way is to put them in a separate tank with a cycled filter and a bit of sand on the bottom is best. After they are laid, wait for 30m or an hour before trying to move them because they are very soft when laid and will burst. Then roll them gently one by one, they are kind of sticky. But try not to expose them to air or at least that's what I was told so I used a small plastic cup to move them from one tank to the other and put them on the front glass. Took me hours.
Then depending on species they'll hatch in 2-5 days max. The eggs should darken in time. Those that go white are infertile.
I have hatched them in a net as well but they are more prone to getting fungus like that because the net can get dusty and dirty from the tank itself and the eggs bunch up together infecting each other. If the net is not fine, the little ones will escape/be eaten by the inhabitants through the net!! Corys are tiny when born, almost invisible.
Good luck.