i'd suggest after you obtain Int. Driving permit book a car with avis or hertz, they offer good rates with 100% insurance & replacement car within 45 minutes of report. You can collect the car from airport & sign off at any designated point.
Local Rentals in DXB & ADH [ Abu Dhabi ] are owned & run by CON-MEN from Palestine, Pakistan, Egypt & India. The shave you to bone incase of accident and charge for number of days vehicle is off-road at workshop.,
Being Visitor on Visit / Transit / Tourist visa you can not drive a 'Borrowed' car of resident on Int. Drv. permit. Traffic offence penalty if stopped by Patrol car, is as high as upto 2000 AED. Any accident involving another car, the OWNER lending you car get 2 black points [ means high insurance rate at time of renewal]
plus you ' as driver ' have to pay penalty & obtain noc from Police before exit -