In case many didn't know, like in the case of a belly fold, it's possible to weaken the wafer, even a convex, horizontally some so it fits better and allows one to bend over or sit some without the wafer detaching and causing a leak. A pencil or a pen can assist with bending it over.
A ring may not hold as well as paste, but usually those with belly folds need more filler anyway, just be mindful that the more paste used, the longer it takes to set up and harden.
I've found out that where I have to apply thicker than normal paste, onto the skin first to ensure a bond, is to stir it to mix some air into it. Or else after that when the wafer is applied and I stand up without sufficient wait time, the paste will ooze down or out causing a leak.
I now sleep only on my back, with pillows under each arm to keep me in place. Applying a fresh bag this way gives all night for the paste to set up and not let gravity inflict it's toll.
This is the terrible price one may have to pay with a stoma that doesn't quite stick out far enough and compounded by a belly fold.