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Nothing special is required to prepare plants for winter. Keep watering if the soil dries out. Check for heaving early next spring and gently press plants back down if the crowns are elevated

Unfortunately, you are outside of their native range. There may be some hope growing these indoors, but you may find that there is just too much heat outdoors.

You can start new stands from seed or you can easily make new plants by digging up and dividing the plant.

https://www.gardeningknowhow.com/ornamental/groundcover/aubrieta/how-to-grow-aubrieta-plants.htm

Yes, that should work. Here is more:

https://www.gardeningknowhow.com/ornamental/groundcover/rock-cress/growing-rock-cress.htm