On my road bike, I used to run SKS race blades (sounds like it might be the kind of thing you are after), but they limited my tyre size too much (might not be a problem for you if you have lots of clearance). So now just use a generic straight rear mud guard which attaches to the seat post. This is enough to keep water from splashing my behind with cycling in rain.
On my trifox gravel bike which I got recently, I am not using any mud guards though as I prefer the look without them. 😀 Plus if you are going somewhere muddy, you are going to get mud on you whether you have them or not.