Concurrent Remote Access to Quickbooks

A potential small accounting client called and asked about setting up the following scenario:

They want to have their clients remote into a server, then log into Quickbooks to work on their own data. There might/would be multiple clients remoted into the server at any given time working on their own individual QB files. There are currently 10 clients, but that list would be fluid.

The potential client currently has no server, so the whole thing would need to be set up from scratch. Are we talking about a Terminal Server running under hyper-v on a Server 2016 host? VPN or SSL VPN connections using a business class router? Licensing?

Have never worked with Terminal Server/Remote Desktop Services, so am not familiar with all the bits and pieces needed to set this up..if it's possible.

Once I identify all the necessary pieces, I can put together a quote for them.

Would appreciate any and all pointers!

Thank you!
Mark