Schraubergemeinschaft – how do you secure yourself?

Hi, I have a hall, there would be room for 1-2 other cars and I would like to screw together with others privately. However, I guess that I am then the stupid and carry the complete risk. Although I am quite often there, but not every day. The rental contract runs on me, I probably also have the most tools. How can you secure yourself? No one can then prevent you from clearing out the hall when you are in it or if you live in it … How do you do it? s?