I don't dedicate interfaces for management, management traffic is so low i don't see the point.
On my DD9500 i have 2 x 4port 10 GBE SFP cards. Let's say card one is in slot 1 and card two is in slot 4. So my network interfaces are listed as such:
I created an LACP interface using port 1a and 4a (each port is connected to different Nexus 5k switch). Then ports 1b,1c,4b,4c are port of an ifgroup. I left port 1d and 4d for future expansion or replication needs.