I think a barrier ring helps with leaking and healing the skin, but in the case of a short stoma, it can also make it shorter. The ring is usually 2mm+ and if your stoma is short, having something that pushes the flange 2mm off the skin can make the stoma stick out less. So if you can manage the skin with powder and barrier wipes/cream (apply it multiple times), probably better not to lift the wafer by placing a ring - really depends how long the stoma is. If it's under a quarter inch, i can't see a ring helping :(. Stomas can also be longer and shorter throughout the day so even if you just placed the flange and it looks perfect, the stoma can recess a little and output can go under the wafer, and with a ring, it can recess to look like it's shorter than the flange. I think the best appliances for this are hollister convex and convatec convex moldable (both are flexible fabric and help the skin in my case). Salts is also great and I can use that in a flat because it's very flexible and thin but it's difficult to get in the US.
I also change often to make sure nothing is going under but I am starting to get more confident so I can change less often. In our case, it's better to change more if you're worried about
output under - output on the skin is the worst thing for us. When you find something that works, you can switch less often and the skin should really heal!!
I have never had a good stoma so I can't relate to that. Just this short one since day 1. That was not long ago so I am still learning