It does look the spindle comes with a 36v power supply, so you should be good to go there.
You will need the relay. Not a good idea to run 36v through the little Sang controller.
And if you write to Xin, firstname.lastname@example.org
, he is very good about putting special order packages together for people.
This is how I mounted my beds. It REALLY helps a bunch to spring-load the beds. And I do not think it would be a good idea to lay them right on the PVC table of the Zen anyway. They do get up to 110c .
I am only using one bed right now, but will have the other bed up and running later.
Hope that all helps you some....