They show all the charges online (state and local taxes, fees,,etc) at any of the major car rental companies.
It typically more expensive to rent out of the airport location - even if booking online. Take Light Rail to a neighborhood with car rental company within walking distance. Ravenna station has two (Budget, Enterprise). I don’t know if there are any to avoid… I would probably stick to one of the major companies - just since they have good networks if you have issues with your rental.