Tom, happy to see yours faired much better than mine this year.  (Dirty Rat Snake in my gallery)
I have learned to keep the doors on my out buildings closed during nesting season and block a couple of small openings to my screened front porch.  I have also built a couple of nesting sites which they have used. Any cozy sheltered spot is game for them.   I didn't know about the multiple nest fact,  I had wondered why they disappeared from the nest in my water softener for a short period.
Mike