I personally wouldn't recommend it. You would get competition for food, would need TONS of hides, and it's more difficult to determine which geckos eat and poop on a regular basis. If one gets sick, they all can get sick. Sometimes they'll bully each other for food/space. And it's almost guaranteed that you'll find missing tails.
If you're getting into breeding, I suggest getting a rack system. You can even build one yourself with the right knowledge. I house all of mine separately, as it's
1: easier to keep track of feeding/pooping.
2: easier to keep track of the genetics/separate geckos
3: easier to keep them healthy