
Re use of crates, or not. The first time we saw crates being used was indeed out in N.America at shows. There were virtually no benched shows at that time (there may be now?) so people used crates. So we bought a couple. Over the years, we had only used them for shows/travelling in the car as we had a puppy pen in our homes. As our numbers increased, we did use them for some of our hounds, at night. However, much as they are not for some, and I hate the apparent 'crate abuse' that's going on (dogs spending way too much time in a crate) they are a valuable aid for puppies when they can't be supervised, to keep them out of mischief and danger. We have never had any problems with getting our hounds used to being crated - in fact the two we have now are crated overnight and 'line up' to go in them last thing.
I'd never crate a puppy during the day for longer than 2 hours, and if needed at all, adults no longer than 4 hours, other than overnight.
I hope you, OP, can sort out what works best for your two!