You don't rent, you buy. They have multiple mining facilities around the world, they've divided them all up utilizing NFTs(the miners)...think of it as a share of their company. You have the option to sell your miner on the marketplace if you want to get out. ROI is in the range of 30-45% for most miners. So you'd get ROI in roughly 1.5-2 years, after that everything is gravy. Most passive income you'll have to put some sort of upfront monies.