You can read up on Tony Grainger's thoughts here. https://www.graingerdesigns.net/the-...-pickle-forks/
Floats with canoe sterns have some problems with squatting upwind so are generally less favored these days. So it's a balance you want buoyancy fairly low down to reduce heel but not so low that the float slams and you want the bows to be able to shed water easily.
As a rule of thumb you want your daggerboard to be in the middle of the balanced sail area wherever that happens to be. On a trimaran you can position the mast well back if you like as long as you adjust the volume of the main hull to trim appropriately.