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What's the best uv's for 3d painting?

I have been trying to 3d paint a post box but it is a bit of a struggle cause mudbox just crashes with-in 5 - 10 minutes of using it but, I was wondering how the uv's should be.

For example I wouldn't assume it would matter on their layout cause i'll just be painting onto the uv's. So if I out my model into blender and do a smart uv projection it just lays out the uv map everywhere. I know this is isn't amazing for texturing but does it matter for 3d painting?

Pic related, this is the uv i am using at the moment because I chose to texture in the node editor using blend nodes and such so it is relatively neat. but could the uv's just be anywhere as long as they are visible for 3d painting?