Do we need more than one car for our group?
Say how many people and how many cases and the desk answers it for you, because the honest answer depends on the luggage at least as often as on the heads. Executive Sedan seats 3 and holds 2 bags; Luxury SUV seats 6 and holds 5 bags; Executive Sprinter seats 11 and holds 12 bags; Flagship seats 3 and holds 2 bags.
A party of six with hand luggage is one Luxury SUV. The same six off a transatlantic flight with a case each is not, and finding that out at the kerb is a bad way to start a week. Luggage is the thing people under-count when they book, and the only one that cannot be solved once the car has arrived.
Where it does take more than one car, they are booked as one arrangement rather than as separate rides: the same arrival, the same meeting point, one price agreed in advance and one person on the desk who knows all of it. Nobody is left standing while a second car is found.
For a party that is going to stay together all day — a wedding, a corporate group, a family on a long weekend — ask about booking by the hour rather than ride by ride. The cars stay with you between stops instead of being re-summoned at each one, which is the difference the group feels most.
Reserve a car
A captain booked ahead, a price agreed before the car moves, and a concierge desk that answers.