[Closed] cheap smart trainers for zwift, getting confused

wife isn't too keen on me riding on the road in the dark for my winter training. So I watched a couple of youtube vids on cheap zwift setups.
But I'm getting a tad confused on the smart turbo trainers as I clicked on one last night that is called 'smart' yet it doesn't let zwift adjust the resistance.
So in short what are the cheapest smart turbo trainers which allow zwift to adjust the resistance?
thanks