I recently installed the Stealth Hitch on my 2021 BMW X5 45e with M-Sport package, and am very pleased with the finished results. I opted not to order my X5 with the factory tow package for two reasons: the factory hitch eliminates the "kick to open" feature for the rear hatch, and it also ruins the clean appearance of the rear bumper by having the hitch receiver always exposed. I am very happy that the Stealth Hitch has neither of those issues.
Installation was not easy - I opted to do it myself without any assistance - but this was entirely due to the challenges with removing the rear fascia from the vehicle, not with the Stealth Hitch itself. In fact, once I had the rear quarter panels and bumper removed (all one piece), the removal of the factory parts and installation of the Stealth Hitch was actually quite simple. And the excellent fitment of the parts was evident, as there were no issues getting everything back on once the hitch parts were installed. Every single thing you need for the installation other than the standard tools is included with the Stealth Hitch.
With the hitch receiver removed, it is absolutely impossible to tell that my X5 has a hitch at all. The only way to see it is to literally lay down on the ground and look up under the bumper from below. It is completely hidden.
I'll try to add some pix to this review to show the before and after (which look identical. :) )