This is an alternative option to the official Meural MCAS327 Swivel Mount. You can bolt it to the back of your Meural Canvas to allow it to rotate on your wall.
For the base, I would suggest printing on the large chamfer at the top back of the model. You should only need to support the ridge from the arc and possibly where the cable channel starts.
The puck should be able to print flat on the print bed.
You will need