Yes, they'll all be able to do well in containers. Much better in larger fabric containers.
As for my experiences with Excal, I only had good ones--but that was all before COVID. Unable to comment about current status. I was able to tour the property to find what I needed, so not the same you're dealing with. The lady which drove us around, though, did not seem to be familiar with the varieties and spoke little to no English. So we had to inspect and select the trees on our own.
So if those are the same individual(s) collecting the trees from the yard and bringing them to the car, there could be some confusion involved with that.