BOL....best of luck
Just a guess.
Mine are all free sleepers when they prove reliable, I prefer to have a dog have free roam of the house at night. However, they are crate trained as well. We travel and take their crates as staying at other homes it becomes courtesy. So yes to your question, crate train. While it may not be needed once they are reliable, the crate may be needed at different times.
We went to our daughters home for a few days and took Allie and her crate, that way she could be in her crate when we were gone and not roaming someone elses house, I felt better that way.
Currently Allie sleeps with us and Ice sleeps on the floor. (right now he is in the crate at night due to other circumstances, but once we get settled again he will graduate....again.
BTW: Lynners did not fail fostering! Tashis won her ♥. Lynners is great at fostering!