I have used different types, If you are going to tow the car regularly I recommend an RV attachment. That would install pink links through the bumper grill. I have never had one, but have seen cars with them, both attached and driving.

Don't these typically have you lock the steering so the car acts like a 4 wheel (tandem axles) trailer?
Maybe I am thinking of the wrong thing, but even two dollies do not have wheels that turn.

Or is this one of those "put the car in neutral going down hill in the snow" discussions where everyone dies it different and now one is really right or wrong?