If there will be equal amounts of water on each side of the baffles, there wont be any pressure on them at all. Not sure of your sump design but keep this in mind. Some could be thicker than others. Might save some $. Like for instance... bubble traps usually consist of three baffles. Depending on the layout, they could possibly have the same amount of water on each side of all three peices.
Just my $.02