After our QuickBooks conversation we had yesterday morning at xxxx I clearly understood that QuickBooks on line is not an option for you, no matter what flavor it comes. I verified the alternative options to have QuickBooks setup on your new desktop as a Host to which we can connect as many QuickBooks concurrent users as you like. This is feasible. This solution it is not recommended by the QuickBooks team but it works and I think that this may be your best solution for your needs.
The cost for this solution is $ 349 annually for 2 QuickBooks Pro 2016 licenses or $ 499 for 3 licenses. In this case I need to create a Local Area Network (LAN) between your two computers in your office, and share the company files between them. In addition to this I need to create some exceptions in your firewalls to guarantee the smooth flow of QuickBooks information between the host computer and the second PC.
This configuration may take one or two hours longer compared to what I quoted you for the QuickBooks on line. But it will be locally installed and you will like it much more.
Please let me know if you have any other questions.