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Don't - dahlias can dry up and die if they get too dry.
To clarify-he stored them in a box with vermiculite and he damped the vermiculite-he did not say keep them moist -just not to completely dry out-I find they seldom completely dry out and I cover mine with newspaper
His were kept in frost-free greenhouse where the temperarure did not drop below 5c as I recall so pehaps a tad warmer than usual and he also said to inspect them occasionally-good advice
If you think about if kept in the ground they are never going to dry out and always be moist
It is as usual what works for you-ignore what you l like-but why "as ever" Hostafan 1?
By contrast, I've never had any problem with rot in an airy garage, but I have lost them through drying out. As Geoff says, they never dry out in the ground.
I thought you waited untill the frost has killed of the folige and then dig them up turn them upside down for a week or two and then store them in a cool dark place in a brown bag or straw.
turning upside down to let the water drain out so they don't root