Germans living in Beijing: plan to spend 6 weeks in Dubai with family living there. Do we need visa?

My wife, two children (4 and 2 years old) and I plan to spend 6 weeks this winter (end of Dec - early Feb) in Dubai with family who live there. We live now in Beijing (where I also work):
1) do we need to apply for it in UAE embassy in Beijing?
2) if I plan to leave and come back within the 6 weeks while in Dubai, will I need to apply for multiple entry?
Thanks
Samer