What do you want the dihedral to do? That must be answered first. A free flight sailplane must be able to recover from any upset so requires a good bit of dihedral. One with aileron control needs hardly any.

Since it is a kit, it’s not unreasonable to assume that the designer specified the dihedral that gives the best compromise between control response and lateral stability. You can’t go wrong building it as designed.

Dihedral is simply a way to make an airplane roll away from a sideslip. It’s essential for free flight, necessary for rudder only control, and a handling quality thing for aircraft with direct roll control (ailerons).

Whether to use straight dihedral or break the wing in several places is largely a matter of art. Whatever looks good to you.