Rental Cars Gulf States

Not sure if one way is allowed with any supplier. Does this cross any border?

OK. Be sure you follow the next instructions when you search for one way hire:-

If you intend to drop off the vehicle in a different location from the pick up location, then tick the box “Return to a different location”. If then no cars are displayed at STEP2, then one way is not permitted between these locations. For one way rentals sometimes it can be a fee. This is always included in the total rental rate and payable at the desk on arrival.

I don't see any results for one way rental, I searched for Airport to Airport and City centre. Crossborder is only allowed with supplier Sixt, they say this:-

Travel Restrictions; Cross Border Rentals are on request only. Please contact the local rental station. Contact details can be found on your voucher.