I recommend you get a few plants maybe float some hornwort and get some Anubias. I use Nana, but any plant with wider leaves that you like will work.
In my experience corys love the dimly lit little areas and they like to stick their eggs to the under side of the plants.
Try to get a good group with about two males to every female.
Once they settle feed some meaty type foods like blood worms, black worms, tubifex.
I feed mine some shrimp that’s chopped extra fine once or twice a week.
Seems to get them far and happy and ready to do the deed.

After a few weeks of these type foods I will do a couple big water changes a little cooler then the tank . That’s usually all it takes to get a spawn.
Good luck with the project.