I think Tianzheng Security means a good thing. There is no need to think of another one. If allowed, how about calling it Beijing Tianzheng Intelligent Security Co., Ltd.? Or it is called Beijing Tianzheng Zhixing Security Co., Ltd., which means many stars of wisdom. I believe there will be no duplication of these two. If it's not allowed, then I'll reconsider.
Or called Beijing Tianchen Zhixing Security Co., Ltd.