The problem with letting oneself do this at this kind of stage is that it becomes a crutch you can't do without - big no-no! There are plenty of things that serious players do, which close-up videos reveal - often long after the event - which nobody would counsel early or intermediate players do. Its really not a 'do as I say not as I do' thing, more, we have to be able to choose whether or not to do a particular thing at a particular for a particular reason. And the thing we have to be able to do when required is keep the fingers free, so I would prefer to keep to that, though damping is kind of a tangential reason for doing it - so yes OK if damping is required, but again, don't start to feel you need it to be secure.
Carcassi 17 is getting well up the scale of things but Luke I suggest if you have the question go for the freedom - even when that can be the freedom to miss!
Simon Ambridge Series 40 (2005)
Trevor Semple Series 88 (1992)
Louis Panormo (1838)
Alexander Batov Baroque Guitar (2013)