Attach awning to multirail without drilling?

[Wilshawuk]

Hi I am looking to fit a Thule ornistor awning to my vw t6 which already has a multi rail attached. Is it possible to attach an awning to the rail without drilling additional holes in the van?

 

[AJCConversions]

We only fit fiamma awnings, but even with the rail it still has a body fixing using the fiamma brackets.
I'm pretty sure it would be the same.