Does a breadboard exist that the Cerb40 II with header fit into? Does the DuinoProto prototype board work with the Cerb40 II ?
The Cerb40 is designed to fit in a breadboard, so it’s very friendly. Any breadboard with standard spacing will work.
Duinoproto - can be made to work but it’s function is not really to have a Cerb40 installed on it, but there’s no reason it can’t. It will take up a lot of the area on the prototyping area and make it less than accessible (I think there’s 5x the 0.1" holes between the headers) but it will then allow you to wire the cerb40 up to the Arduino headers and the sockets as you choose.