If you are already using proxies on Followliker, then perhaps there is no need for 10 windows to run many instances of followliker, as you will need to pay for additional FL licenses as well.
But if you really need 10 Windows, that can be achieved through a virtual machine. You can setup multiple virtual machines on your PC, and you will need multiple IP addresses from your ISP, or if that is not possible, use Proxifier to change the entire outgoing traffic for that 1 virtual PC, to the IP of your proxy (which is similar to using a proxy on FL instead).