I've never had a dog that wasn't an inhaler. I've yet to have one encounter any harm because of it. I do teach all dogs here to respect other dogs' food bowls, and to not attempt to steal treats from other dogs.
For bloat prevention I would consider feeding two or more smaller meals a day as opposed to one large meal, limiting exercise for an hour or two before/after eating, and avoid allowing the dog to consume a large amount of water within an hour or so of eating. I believe those things are more important than how fast (or not) a dog eats.