It was with some trepidation that I opened your FB page but I am delighted to see your raised feeders are not too high. People often feed tall dogs from raised feeders that are at eye/face level with the dog...this is incorrect. Dogs should still have to bend their head down towards a bowl. There are many reasons touted as causing bloat and possible gastric torsion in deep chested dogs such as eating too much, drinking then eating etc etc but in reality research shows that only one thing is proven to contribute and that is 'aerophagia' the 'ingestion of air'. Yes, caused by raised feeders. I feed my own greyhound from a raised feeder, always have, he's old now so it helps, but I make sure he still has to lean down into the bowl.
p.s your feeders are lovely