Annuities vary wildly, make sure you read all the details and understand everything 101% before buying.
Link to a guaranteed 7.5% annuity? I doubt such terms exist.
Annuities are generally not great investments, you buy them for the security/guarantee they provide. Don’t buy from a fly by night company without a good history because if the company folds you’re out all your money.
If you are invested only in CDs you’re doing it wrong, you need to have money in the markets to get any significant returns.