I have only dabbled in drop-shipping before when I had an eCommerce platform 6 years ago or so. I think it is something that you could do on the side, but you would want to do in depth research on the industry you want to get into before setting up shop. It may be a little less passive up front, but over time you could take your hands off the wheel.
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In order to collect rental income, you will need to purchase real estate or own real estate. This would involve putting a down payment and then borrowing a home loan or mortgage (or if you have it all in cash, by all means!). If real estate prices go down and you sell, you will lose money. If real estate prices go up and you sell after collecting rent for a year, you will do well. Just like the stock market, the real estate market is cyclical and there is inherent risk in investing in real estate.
When money is loaned to a partnership or an S-corporation acting as a pass-through entity (essentially, a business that is designed to reduce the effects of double taxation) by that entity’s owner, the interest income on that loan to the portfolio income can qualify as passive income. According to the IRS, “Certain self-charged interest income or deductions may be treated as passive activity gross income or passive activity deductions if the loan proceeds are used in a passive activity.”