Yes, as a driver you can request more than one car. Actually, we encourage it and here's how to do it.
If your booking requests are for the same start date and time your bank will only hold on your card (pre authorisation) the amount for the most expensive rental. When an owner accepts, the rest of booking requests will be automatically cancelled.
If, in the unexpected event, that no owners are able to accept your request, then we will advise your bank to make the money held on your card available for you again. We do this immediately though your bank may take a few days to action this.