How do I mirror from windows PC to multiple ipads at the same time?

Work in a band. Band uses a Windows 7 PC and I need to mirror that screen to at least two, and up to four, ipad screens for other band members. The ipads only need to mirror the PC screen. They do not need to have any control or influence over the PC - just observation. Currently run AirDisplay to connect one ipad but need to connect multiple now.

Air Display doesn't work - won't connect multiple devices from PC and one of the Ipads is a first generation and doesn't use Air Display

IDisplay doesn't work - doesn't mirror from a PC, only extends

PLEASE help! So frustrating. I know there must be a way!