You said it won't help with stomach twisting, but I don't think that is correct. Gastroplexy prevents stomach flipping or twisting. That literally is the purpose of the surgery. It doesn't prevent gas or bloating but it does prevent the life ending stomach twisting
So far I have never had any issues with any Dobermans of mine and bloat. Of the 6 I have buried so far none ever had any issues with bloat and never required any sort of surgery to prevent it.
I do follow the same tips that strykerdobe mentioned and believe they are sound tips to follow.
No hard exercising, jumping and running 2hrs before feeding and at least for 2hrs after feeding and keeping them in their crates napping. Not a lot of water during play.
We always feed in a bowl on the floor.
A lot of owners don't understand that some stomach movement is normal. Most times they never see it when it does happen or are never looking in the right place to begin with to try and see if it is happening. Gets harder to see as well as the dog gets older.
Had a young puppy one time that showed me first hand just how much a tummy can 'normally' move around and not be a problem.
Girl was around 3ish months old and when I would go to feed her and watching her as she ate I kept seeing what looked like a finger poking out from under her skin and moving around back in her tummy area. Looked pretty clear to me that somehow she had a broken rib back there.
Soon after the meal was finished I could not for the life of me see it any more or tell where exactly it had happened at. Zero signs of pain or discomfort when pressing on the dogs bones back there and doing a hands on inspection... The stuff just went away and everything was back to normal looking - within minutes of the meal being done.
Until the next time I went to feed her and I saw the finger / rib bone poking out from under her skin again!
Just like the previous times everything went back to normal as soon as the meal was done and dog never seemed to be in any pain.
I saw that bone poke out and move around enough times that I was darn sure that dog had a broken rib regardless of if she felt no pain or not or if I could not see it all the time or not so I scheduled her a trip to the Vet.
Vet did the same thing I did at home. He looked at her, squeezed on her back there, had her move / walk around a little while he observed her... Told me 'She was fine / nothing to worry about here and that will be $65.00 now, Thank You!'.
I insisted on an x-ray cause I am smart and knew darn well that dog had a broken something going on back there. Vet did the X-ray as I requested then showed me how nothing was broken and everything was as it should be with respect to her rib bones. Then explained about cartilage forming / hardening and doggie rib bones back there (floating ribs), how the tummy naturally moves around when the dog is using it / eating and can sometimes push a rib out of place like I saw when moving around a lot, and how by the time she was 6 months she would be developed enough that I would not be seeing any of this stuff any longer.
The guy was correct in everything he told me. I just did not know because 'floating ribs' is not quite as common in Dobermans as it is other breeds and I got 'lucky' with one.
If you watch closely back there where their tummy actually is when they eat (and especially when it is a 'high value' meal they are having to wait for you to prepare (dogs are anticipating it) - You will see stuff (the stomach) moving around and that is completely normal. Becomes harder to see as they age and develop but it is still happening.
If they got to watch and smell it as you cook some stuff like this up for them and then see you mix it in with their kibble -
Them tummies is going to be moving around!
I never saw any signs of anything amiss with that same girl if the meal was 'boring' for her. Plain kibble never resulted in any poking out of anything regardless of her age. A pile of meat in the kibble would do it every time (until about 6 months of age like the doc said).