Hosting QB in Cloud

Hi All, I've posted some questions on here before and had some great help. I'm a IT tech who has been tasked with getting an accounting firms QB data into the cloud. They do not want to go QBO but want their current QB Desktop files to be hosted in the cloud with QuickBooks Hosting. I seen a bunch of commercial hosts through the intuit hosting program but would love to hear some feedback. The accounting firm currently does books for over 100 companies and are just having issues filling up their current in house server. I've started moving a lot of their older company files to Sharepoint online (I've had success with it before) but I feel like a more concrete solution with a proper hosting platform would work much better. Other important notes. We're located in Canada and they also use those other programs that I'd love to see in the cloud as well (sage ect.) Any input would be great. Thanks Regards, Diana Dickson