Page 398 of 2014 Accord manual simply states: "Your vehicle is not designed to be towed behind a motor home."
If a salesman or dealer sold it to you knowing you wanted to use it as a toad, you might have recourse. I suggest you contact Honda.com to find out why they say this. With all the systems, sensors, and electronics it might be an issue or it could be structural. I did see that Blue Ox makes a base plate for 2013 2014 Accords, would they make one if it couldn't be towed? It might be a warranty issue if you tow one. I'd check it out before modifying.
eTrailer doesn't list a base plate for Accord.
Blue Ox Products
Owner's Manual | 2014 Honda Accord Sedan | Honda Owners Site