Obtaining the Chase Marriott Bonvoy Boundless Visa card ($95 annual fee) and the Marriott Bonvoy AmEx business card ($125 annual fee) would earn you 15 nights each upon approval and at the beginning of every calendar year. That is a total of 30 nights per year if you have both.

These cards are available to U.S. residents, though similar cards are offered in some other countries.