To rank Detailing company with no physical address?

Hey if local business doesn't work on physical location . But provide mobile services or home based services on thier specific mentioned area. 1.we should add his physical adress in the listing? (as he doesn't serve on that physical address. Only office there) 2. If we do not add physical address so how would we do NAP? 3.For the website we will have one physical address in foter as his office address.? Or what would we would do. Thanks