R1250GSA: Installing a 65 Liter Pillion Box

Installing a box on the back of the GSA. Need something until I figure out what I really want. Here's the info incase you may want one. Donpida Universal Motorcycle Top Case,65L Motorbike Tail Box Trunk Tour Storage Carrier Case with Backrest, Security Lock and Handle for Helmet Luggage,Black. https://www.amazon.com/dp/B0BNL3F3VG?...