Your commissioner sets the roster requirements. Looks like they allowed only 2 DL spots. In the 2 years I've been a commish, I use the 15% rule. I have a total 24 roster spots per team. 15% of 24 is 3. So I allow for 3 DL spots for my team managers to use. That's plenty. Anything more is pointless. Anything less is too restrictive.