I am going to buy the stuff for the setup but I am not sure which product are suitable for me, both 15 monitors connect to single pc is preferred.
Thank you for your interest. Most modern systems support a maximum of 6 USB graphics adapters, so that is the maximum we recommend and support.
This is mainly due to available USB resources on USB 3.0 systems, which we cover in depth here:
When more than 6 displays are needed, or if the intended use isn’t a good fit for USB graphics (i.e; multi-screen video playback, gaming, etc), we typically recommend going with a desktop PC system with multiple graphics cards.