If sitting, iconography shows the instrument mostly resting on the right thigh
(as also often found with contemporary lute depictions) rather than cradled in
the lap as with the modern 'classical' guitar. The use of straps/ribbons
allows the instrument to be held higher on the body (also
Anything goes. Whatever feels comfortable and allows you to shift from
plucking between the bridge and rose, and strumming at the neck/body
joint. The problem is if you have wings - apparently many vihuelists
were angels - sitting down becomes difficult, but I suppose you could