EBT sources about sitting cross-legged in meditation?

[Viveka]

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Meditation posture

MN 10 And how, monastics, does a monastic meditate by observing an aspect of the body? Here, a monastic has gone to a wilderness, or to the root of a tree, or to an empty building. They sit down in the meditation posture, with their body erect, and focus their mindfulness right there. Mindful, they breathe in; mindful, they breathe out. Has lord buddha mentioned any exact meditation posture somewhere? We have seen that many of the meditators use the lotus or half-lotus postures. What would b…