Are you closing them or are the credit card companies closing them? Refer to the information at the site below.
https://www.creditkarma.com/credit-cards/i/how-to-cancel-credit-card/
I always wondered how long we get, three months, six months. This whole mandatory three credit cards to rent an apartment is really annoying. Hopefully once I buy my condo, I can toss em 😉🏡😸