I'm not sure what the bmw is rated for, but the 435 has a ton of power and torque. I'm sure that motor in one of bmw suv's would be rated double that. A lot of the European manufacturers rate their regular cars for towing over there but not in the US, or for considerably less.
I recently picked up a 19' accord sport, do you have any pics of the set up? I opted for the manual and the 2.0 motor so its got more than enough power thinking i'd be putting a hitch on. But noticed some of the hitches require some trimming of the frame? That can't be good..
I saw they make 1 1/4" receivers which are fine for small trailers, hell i towed probably 1200 miles with my wrx and that size receiver with zero issues. Its all balancing the trailer load and driving properly, and common sense.
My car is with my daughter for a week, so no pic. However, it is a CURT hitch, lots of images on the 'net. The hitch just came out when I purchased it and it did not fit as directed. I ended up getting creative over a weekend and made it work by bolting down through the trunk rather then up through the frame (there is a bulkhead in the frame that blocks the bolt insertion. I called CURT the following week to let them know and they said they were aware of the issue and were redesigning the unit and offer me no help. No matter it was already on and secure.
Your Accord I believe is rated to tow up to 1000# and 200# on the tongue. The limiting factor for mine is the CVT tranny (1.5T). You're golden with your setup. I wish I had purchased the 2.0 because there is a chip available for it that is amazing making it more powerful then a Civic type R or WRX for a few hundred bucks. My dealer has your car ('18) and when I told him about the chip he jumped on it after research.