If you're travelling alone, obviously the passenger's footwell and seat are enough for your luggage. I guess you’re two if you are thinking about luggage over the boot. The luggage rack is clearly the way to go. In my honest opinion, fixing voluminous (and probably heavy) bags to the roll hoops may cause problems in twisted roads and most probably damage the paint.
Therefore, make sure you protect the paint properly, and secure the bags quite seriously
Let me tease you with this post
https://www.speedymarmots.com/hangar-works-10-luggage-set/And we have recently improved the set with an additional bag for our heavy Barbour coats, described in the first pages of this last post
https://www.speedymarmots.com/long-range-campaign-2-3rd-to-17th-of-september-2021/ 
