Raccoons generally attack at night. We had a ton of them but they never went after the hens or ducks during the day. At night you want to house them in a secure shelter with hardware cloth, not chicken wire to protect them. You want to put at least 30 lbs or more of weight, or a really good latch to keep the ducks in, raccoons are stronger than you'd think. If there's a crack in the door make sure no ducks can stick their head through or sleep by it. Or better yet, eliminate the crack. Even if it is hardware cloth, a duck that sleeps by it will still get pulled through. So make sure no ducks can sleep with access to predators.
Daytime animals here are hawks and bobcats, we have two dog kennels like you that our poultry go under when they're scared, and in 5 years maintaining a flock of about 30 I've only had one hawk death for a silkie chicken. However, it only serves as a daytime shelter and nothing more. If you put their pool or tub of water by their kennel they'll have more time to escape the hawk because they can just hop out and hide. My ducks were lazy and spent a majority of the day swimming in their pool, rarely ventured out to forage in the run like the chickens did, unless I came out with some watermelon or mashmallows lol. Netting above their run is a good idea, but I don't have netting above mine. My current set up is the tin cans that I scoop their feed with that hang on bushes, along with aluminum foil pans. I think they are reflective enough. I'd have to wait a year and see if there's no hawk attacks but for now the hawks fly past the run and do not bother.
