They should be fine. They are tough. Biggest enemy is wet soil in winter (but I would water when planting). They need good drainage. Other than that, they are tough as nails. I would cut off any flower stems and let them focus on root development.

plant them close together ... a temporary site ... and have a cardboard box handy ... to cover them for heavy frost or freeze ....

move them in spring ... to a permanent place ...

you do not want them to flush tender growth .. but it might be to your advantage to protect them until the end of october... just to grab hold of the soil.. and set the roots ...

do NOT leave them covered all day long ...

plants shipped this late in the season should be nearing dormancy ... not stimulated to late growth.. do NOT fert..

ken