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Caen showed plenty times they know how to play football, but when the referees don't make unfair judgments against them (which happened a suspicious amount of times), then their own defense ruins them. They need a win desperately, they'll charge with whatever they can, and their main weapons are the center shots and shooting from afar through Feret, which often leads to the corner kicks. From the Reims's coach's words, we can see that the plan is to pull back and bunker up until the main creative forces are back. They will use counter attacks, something that served Fournier for years. And that's a tactic that produces some corner kicks.
Considering that Caen execute 4.7 corners at home, and Reims 3.7 in away matches, I think we have a nice value. A limit on Marathon isn't that big, but different bookmakers have different strategies - you can try with a handicap, a race, or something else.