Theres no 'real' answer to this one to be honest.
I have a Dane, bullmastiff & saints.... some are raised fed, some fed with bowls on the floor .... I know others have the same & have experienced bloat from both feeding situations ...
I think it comes down more to allowing the dog rest time (min an hour) both before & after exercise & not allowing them to drink too much. We also soak their food to allow any swelling to appear in the bowl & not in the stomach.
We are also very careful in the winter to not let the dogs drink water that has become too cold through being out in ice or snowy weather, think brain freeze when you eat an ice lolly etc, i do think that giving water that cold regardless of weather can allow the stomach to spasm through the coldness, therefore bloat a possibility IMO