I am assuming that you mean quarantine room availability.
Every hotel on the Travel Authorization listing must have quarantine rooms available. That is a requirement for certification. And if they happen to all be used (unlikely) then they have agreements with other hotels to settle positive visitors there.
If by chance you are not staying at an approved property, testing positive could mean testing and possible quarantine for most of the employees, potentially leading to a temporary closure of that non certified property.
Another reason to not stay at a non Covid Resilient certified property...