Hi Valentin,

I work on the documentation team for Red Hat Enterprise Virtualization. Yes, Red Hat Enterprise Virtualization supports multiple displays for Red Hat Enterprise Linux virtual machines when you connect to the virtual machine using the SPICE protocol.

The instructions for setting this up are in our documentation here:
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Virtualization/3.5/html-single/User_Guide/index.html#chap-Configuring_Multiple_Monitors

Please let me know if you need any further information, or if there are any issues with the documentation.

Lucy