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I have read several others asking about it too and most have had to have it come with the car. I would ask the MB service center first because I've also read there is a lot to the wiring too if you want trailer lights.
Good luck!
At this moment - when a dealer parts department checks on hitch install for GLE - there are a TON of parts called out that "are recommended" to be changed out to successfully install the MB hitch - including gas tank.
I have had my guys order in the "hitch" alone for test fit without changing out "recommended" parts
At this moment there is NO aftermarket hitch GLE hitch available that I know of yet.
Mine was factory installed and it has been great. Just FYI - Install an electronic break controller. I use Tekonsha Prodigy P3 Trailer Brake Controller.