Accompany with my husband on the Z

Dear people,
I have been in china now for 4 months. i have followed your steps to get me and my baby chinese visa type L from chicago. we both have a U.S passports. Now, my husband's company paper work became offical. His trading and shiping company is under his name and another chinese person's name. He lives in china with a Z which is much easier and cheaper to get. Its so hard for me to travel with my baby every 3 months to macau espacially with my baby' age is 15 months. is there is any way I can get myself and my baby's into my husbands Z? or is it possible for me to apply for a z? and what are the requirments? would they accepet it if i showed my husnad's paper work and our marriage certificate? is there is anything i can do at all to prevent going back to the border gate ever 3 or 6 months?