Cory’s Advice

I’m upgrading from a 7 gallon to a 14 gallon cube 15.5 in x 15.5 in. I complete weekly water changes and maintenance. I’m thinking of stocking some Cory’s, I know they prefer to be in groups. Any advice on types of Cory’s to stock and how many I could get away with? Or is 14 gallons still too small for a group ?