I have had up to 5 dogs at one time, and one thing I insist on is everyone gets along.
I would go bonkers if I had to c/r..
I have five dogs currently and it's silly to imagine them all getting along at all points all the time. No one is truly hating towards another, but my Dachshund has a short fuse with my teenager, my teenager bothers every one to a certain point, and I have two resource guarders. When my second female was added my first DID NOT like her and I thought for sure we would be a crate and rotate home, but every thing has settled in a way where I can trust them to be in the same room together (when we're present)
No crates in involved, but we have an apartment attached to our house that my foster currently stays in. I am hesitant to declare her dog aggressive rather than just fearful, but she does not seem thrilled with the idea that other dogs exist so she is NOT allowed around them and vice versa. We are working to see if she could potentially become comfortable around other dogs, but I'm not for certain.
The rotation itself is stressful for me as well. I work every day from afternoon to evening. At this point I'm hardly sleeping because I am constantly worried no one is getting enough time. I get up at 9, feed my dogs and do things with them. Around 11 I venture to the apartment and feed her, do things with her, and then by 1 I have to get ready for work. When I get home from work I have about 2-3 hours to eat, do normal life things and spend more time with the dogs, and then I retire to the apartment until about 3 in the morning to hang out with her. It's worth it because she's alive, but it ain't easy. It would be SO MUCH easier if she was just fine with dogs and every one can be together, but we manage.