I bought magnetic shades from AliExpress that work really well and were much cheaper than oe. The hatch window shade is a little wavy due to the window contour but you don’t notice it from the inside. The seller seems to have shut down on AliExpress, but I’m sure that you can find another one if you weed through the terrible search engine on AliExpress. Here is a site with a similar product to give you an idea of what they look like:
https://sg.carousell.com/p/laser-sh...agen-golf-r-mk7-4-1-rear-windscreen-31387773/
https://sg.carousell.com/p/laser-sh...agen-golf-r-mk7-4-1-rear-windscreen-31387773/