I would like to stay in Shenzhen for two weeks and apply for visa LuoHu border..

Since I am planning to go to Shenzhen and stay for maybe 10 days, I was wondering whether I could get a landing visa at the border but valid for more than 5 days. I did it once in Shenzhen when I wanted to go to Shanghai and they asked me to provide a traveling ticket. But what if I am not traveling anywhere and just planning on stayin.., what sort of docimentations will they ask?