I would hold back Fiat, let this triple digit temps pass. I try not to get plants when it is forecast to be very hot, whether or not I will grow them indoors or outdoors, succulents or not. From what I have experienced here, no shade is comfortable enough for them, with that blanket dry heat we get. And if you put them indoors, with our AC's cranking, you just shock the plant with the change.
It is different with the established plants that have acclimated already, they can take it. But the younger ones, they suffer a lot. Just my two cents. That is why oftentimes, it is best to start new plants in Spring, temps more cool and warmly comfortable later.
