Can I group our rentals in Safe Harbor as a Real Estate Enterprise?

My husband and I manage 7 rentals.  Two rentals are in his name and his son's.  We file a joint return and file on those two properties.  Five of the rental are in my and my husband's name.  So, we file a joint return on all 7 rentals.  May we use a Safe Harbor and include all 7 properties as part of a "real estate enterprise"?  The Premier Turbo Tax Programs asks for the name on each rental as I set them up; do I put husband's name on 2 rentals as I am setting them up and both of our names on the 5 rentals as I am setting them up?  We put in over 250 hours in the group.  Appreciate any help.  Thanks.