@Damdam ***
just list the first place you will stay. Or since you aren't limited in when you actually need to enter the country during the validity of the visa just put the address of any hotel.
It doesn't actually ask for proof and is leftover from a previous visa application. Like when they ask about the flight info. Not really needed for the DVT but if you aren't smart enough to find something to put in, you probably aren't worth letting in anyway.