I needed a stand to put my daughters Echo Gen 4 on her Skadis board.
I've found a great model for a french cleat here:
https://www.printables.com/de/model/495363-amazon-echo-4-french-cleat-hanging-system
I have printed the model in PETG with 4 perimeters and 25% infill with supports for the slightly lifted hooks.
Works great and can handle the weight of the Echo (non dot) pretty well.
The author remixed this model.
The "heavy lifting" was done by @Sebastien_15130. I have just modded the mounting option from french cleat to skadis.