Roof bag with panoramic roof?

[Drevs]

Hello everyone

I have been considering buying a roof bag for my 2017 Tekna with a panoramic roof.  We camp and have lots of stuff (bedding, coats, etc that I want to put in it).

I've come across one site (a roof box only - sales site) that says you can't use a roof bag with a panoramic roof.  I don't have bars, just the standard roof rails to attach it to (and, of course, would use a non-slip mat).  Has anyone had any experience with a roof bag and/or panoramic roofs?   

Thanks