Hi StephenJ77,
I don’t think there is any need to add a protector to an adjustable bed because there is aleady a mattress on top of it and we don’t use one (I don’t know of anyone who does).
Post #7 here and the posts and resources it links to should be helpful 
The Natura would definitely have more of an effect on the feel and response of the latex than a thinner more stretchy protector and while it’s a great quality protector, if I had to do it again I would probably use a wool protector without the membrane (which usually doesn’t have much noticeable effect but there have been a few times where it may have contributed to me sleeping hot).
Phoenix