Thank you. I used 3 of these on the mega, Seeed Studio, CAN-BUS Shield V2, as they have pads on the back it is easy to run a wire from the center pad to a different pin.
At the moment I am using a Due with the dual can you mention to slow the data down first on the line that is too fast and then input this to the mega. It's working well but not ideal.
I just don't seem to be able to get a 3rd can to work on the Due and I also couldn't get MQQT to work on it- it kept on disconnecting all the time.