Live in a jurisdiction (California) in which you don’t have to worry about this nonsense because employers are not allowed to do that.
Relate at the time of conception or reduction to practice of the invention to the employer's business, or actual or demonstrably anticipated research or development of the employer
Some fat cats are so big and dabble in so many things that you can never be sureYou can worry about being able to afford that $500k studio with a 2hr commute.