I wouldn't recommend importing from US as those cars are not supported by Tesla outside of the US. As for importing from EU, those cars are essentially the same ones as sold in the UAE, the only difference is in the software. A few years ago, when Tesla established presence in the UAE, some of us who had our cars imported from US or EU, were given a choice: US cars were bought out (at fair value, to be honest) by Tesla, and the owners got themselves new Teslas - GCC spec, and the EU-spec car owners were offered to have their cars flashed to GCC spec, and covered under warranty.
I would suggest that you talk to Tesla in Dubai for an option of a CPO (used) car, or look at Dubizzle for a good opportunity - they appear rarely, but you might be lucky.