If you really can’t decide between your deep and meaningful relationship with QB desktop and your growing need for professional bookkeeping intervention, you might be a candidate for hosted QB.
This means your file sits in yet another cloud, and everybody just signs in when they need to. It’s a good compromise. Of course, you do incur additional monthly charges for hosting, and your desktop QB will probably be upgraded annually. But if you are this big, this could be the smallest of your concerns.
There are so many companies offering QB hosting that a list, with or without rates, would be useless. Again, consult your CPA or QB Proadvisor who might be able to add you to their bulk license program.