I’ve used a HandyRack inflatable roof rack and their HandyBag roof bag for years on previous cars. Renault Modus, Focus Mk. 1/2/2.5/3. Great bit of kit that takes up about the size of 1/2 a tent for the rack and a small tent for the bag when rolled up for storage. Just clean your roof before fitting to avoid scratches.
I haven‘t tried it on my shiny new MG4, but I see no reason it won’t fit.
HandiRack roof bars are a great alternative to metal roof racks. Fits most cars including 2, 3, 4 & 5 door models. Easy to fit and store.
www.handiworld.com
I’m not affiliated- just a happy customer ?