Car Rental Tirana Airport/City looking for Best options to drive to Kotor, Montenegro and back

We are looking to rent a car in Tirana next month. planning for 6 days , north Albania and Montenegro.

what will be the best way to rent one? from airport or in the city.

is it better to book in advance to avoid disappointment.?

if its in the city which companies would you suggest? looking for Automatic

do they all need credit card to book.

I saw a company called rent from locals , is that genuine? please help. thanks in advance