Ran across this today -- short mini-pcie adapter with two SATA III ports (vertical) for use in motherboards with a mini-pcie connector for wifi. Looks handy, but kinda pricey ($42) and obviously NOT FCC registered...
https://www.amazon.com/Bplus-PM1061...738619&sr=8-6&keywords=mini+pcie+sata+adapter
https://www.amazon.com/Bplus-PM1061...738619&sr=8-6&keywords=mini+pcie+sata+adapter