The author remixed this model.
Adapted the original Echo Dot 3 holder model to work with multiboard. To attach it to your multiboard you'll just need 2 x small thread, flat head, t-bolt
I used the 20mm ones as my multiboard uses the 8mm wall spacers.
UPDATE 12/09/2024: Re-uploaded the model to the correct scale to avoid any issues. Also uploaded the .skp file.