If you want to choose a great present and make your client happy, you need to know that person well. And, since you have already found their perfect home, you probably know more about them than you would think.
Unless you are going for the ultimate and most expensive smart home setup, you don't need to spend all your monthly income on buying lots of components, sensors, smart bulbs, security cameras, etc., since for most users, it would be overkill anyway.
