As you're seeing here, everybody is going to recommend what they tow or have towed with. Soo, I'll just do the same, haha:
The Ford Taurus that Ford built up until 2019, provided it has the V6 engine, is flat towable (and its automatic). Also, the Ford Fusion Hybrids that were also built until around 2019, can be flat towed. I've towed both of those and they both work great.
Now, if you want something fun to drive, and very simple to flat tow, been around forever and still being built new today, look no further than a Jeep Wrangler. Thats what we tow now, and it is the simplest to tow I've ever owned. Setting it up to tow was the easiest, too (Jeep is only vehicle I've owned that I was able to do all the towing setup myself, didn't have to hire a mechanic). It is the most fun, too. :)
As already said, the choices for new vehicles that are flat towable keeps getting slimmer and slimmer. If you're willing to buy a used vehicle, you will have a lot more choices.
Good luck, whatever you decide.
