any set up that works is good.
but first, set it up and check the long term temp - yeast does best in the 80-90'F range. too hot and yeast is killed.
a light bulb on in the oven is the usual - but if you have to pre-heat the oven . . . . .
I just put a plate/lid over the bowl, I don't worry so much about humidity. sometimes I lose track of things . . .