"Safe income"? Sure: US government securities are safe - I'm sure they always will pay you principal and interest when due. But yields right now are puny, and your question does not address risk issues like duration, or liquidity.
Cash is a disfavored asset right now, so, if you can afford to be patient, I might recommend husbanding it until the day comes when it's more dear than it is today, and thus buys more.
I think the bank trust preferreds, as an asset category, still work pretty well. You can get 8%+ from most, and >9% for the structurally weaker ones. But these have duration risk, even if there is good liquidity, and, IMO, no meaningful credit risk.
If I could get a borrow on DNP I would be building a boxed short a mile high right now.