Actually looking at an Arona I reckon the roller blinds hook into the holes they provide in the rubber bungs.
Ateca has the bungs, but no holes in the bungs unlike the Arona (tailgate we are looking at). Wondering whether the Karoq blinds clip into holes in the bumper bungs. Perhaps it is all interchangeable if the bungs are swapped out. Over to you for more research of Karoqs. You'd be able to order the parts from Skoda if it's a swap out. Parts are cheaper from a Skoda dealer, no postage.
Found a German forum on Skoda which said you couldn't do it (forums aren't always right) and this one... look at the pictures and that's where I reckon the fixture goes through the hole in the bung if you had one... may be it's a bung change... but don't blame me.
https://www.ebay.de/itm/Versenkbar-...4b59bfb2eb:g:pcoAAOSw~atcKNoc&redirect=mobile
Skoda part number is 57A867871 for the blind... bungs you'd have to source as well.
https://www.google.com/search?q=skoda+57A867871&ie=utf-8&oe=utf-8&client=firefox-b-m
What you'd need to do is get a friendly Skoda dealer with the Karoq in fitted to try it out on your
Ateca to see whether it fitted into place. They could probably order the bungs in or use your charm to get them to fit it if you you just need the bungs for the pins to go throw, assuming the opposite end fitted.
Looking at this video below the action can be seen on a Karoq. Best to checkout a Skoda dealer after lockdown lifted. I see there are second-hand ones on ebay, that may be from Seat people who stumbled on the fitting but couldn't ?. Uses those pins threw the bungs where least my
Ateca has bungs but not holes in them. All of that needs checking.
Would be nice to know whether its a standard swap or not with the bungs changed. Clearly if the Karoq parcel shelf panel doesn't fit the
Ateca the roller blind won't. Whether the Karoq with variable rear seats has a different fitting - that needs checking. Depends how much VAG moved away with the tailgate bung holes and the blind / shelf fitting

.
At 24:30.
A German post talking about converting a standard Karoq into one with the roller blinds. Ends on the hooks needing to go in. Think you got to eyeball a Karoq with it and borrow the blinds in a Skoda dealer to test out the fit and establish what needs to be done to get the hooks in place. Suspects it's the bungs with holes in them like the Arona.
https://www.skodacommunity.de/threads/kofferraum-rollo.128012/
Tell us whether it's a Yes or No on the fit.