Always on the upper inside of a small shallow bowl, and if more than 1 egg in a recipe...I then break the egg and open it in the small bowl, and then into the ingredients or a larger bowl or dish.
Many a time I would crack each egg in the same bowl, and find that one egg that was just off color, or was all watery albumen. No No No...that will spoil the whole bunch of eggs; and worse, if it goes into a batch of ingredients.
Gram showed me that gosh, I think I was like 8 years old.
Then there was that one show and tell that happened one day when Gram cracked an egg, and EeeeeeK the egg had a "Beak and Feet"..and stink!!! Whew!! .... "Now that was the best lesson I ever learned in cooking!"