Mounts to the top storage cubby using the existing two trim srews. Print the base plate and the posts separate and a simple drywall screw connects everything. I'm starting with PLA Pro and going to see how it holds up as it warms up, maybe print in PETG later.
This is just the base plate with three mounting posts/balls. Others have made great ram mount attachments to connect to it.
April'24 update: As expected PLA Pro did not hold up to even spring temperatures. I've reprinted in PETG and we'll see how that goes.
The author marked this model as their own original creation.