The holes for this mount should fit the Goofoo Nova and perhaps the PLUS ( I do not have that printer)
We power the PI using a UBEC for powering servoes in RC.
40mm blower fan push air over a heatsink and back in the printer. This setup is running on our Goofoo Nova that are printing almost 24/7 with prototype printing.
Also exported as .step
https://thepihut.com/blogs/raspberry-pi-tutorials/using-a-ubec-with-a-raspberry-pi#:~:text=Hooking%20up%20your%20UBEC%20to,watch%20you%20Pi%20power%20up!