Each vehicle is different, so you need to check with Blue Ox or with Roadmaster about your specific Edge. Our Explorer required little modification and none noticeable unless you get down and look under the bumper. The addition of tow adapters to your frame may actually add to the car's resale value. With the brackets removed, the only really visible tow part on our car is the small mount that Roadmaster put the electric and air ports on for easy access by the license plate. Even that could be mounted less visibly if one was overly particular; it just wouldn't be quite as readily accessible.
As mentioned, each car is different, so the first thing I'd do is check out Roadmaster's site (but then I'm a Roadmaster fan
) and see if they reference your exact model at all. 07-2014 Edges are listed:
http://www.roadmasterinc.com/bg_/bg_rmi_std.pdf If not, just call their 800 number and get their direct input. http://www.roadmasterinc.com/contact.html
Joel