Have picked up cars in Miami in the morning more than once and never had a problem. Miami airport car rental is large and the airport has more business travellers than Orlando so they are used to collections at differing times of the day.
The only time I had a 'problem' at Miami was several years before you could select your own car with Dollar and was given a PT Cruiser which I do not like - went back into the office and asked if they had something different and they said if I waited 15 minutes they would have one washed and ready for me - satisfactory result.
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