Do I need an ID card for each person to open a hotel in China?

According to national regulations, yes.

You can drive a car for two people.

There must be two hotels now, or the hotels found by the public security bureau during routine inspections according to regulations will be fined. If the circumstances are serious, criminal responsibility shall be investigated, which is a new regulation issued by the state after a foreign-funded hotel was investigated and dealt with for openly engaging in sexual transactions a few months ago.

If you care, you can find a family hotel. Usually you don't have to pay. For your reference only. Of course, there are also daily rent and so on.