Can you empty out the room and and place the Longarm table diagonal across the room? I know this isn’t ideal, but it would at least fit better and allow your access to the back of the machine.
I’m also currently shopping Longarms. There’s a Handi Quilter near me, and I test drove the Amara. It’s a nice machine if you’re just buying it for personal use. I don’t think it’s built to do quilting for the public, however. If that’s something that might interest you, it might be worth looking for something more sturdy.