This is a model of a wall-mounted hook for folding shopping, utility, or laundry carts. The slot for the handle is 1.5 inches x 1 inch. The hook is designed to be mounted with 2 screws. I used two of these hooks to put up my shopping cart which weighs roughly 7.1 Kg or 15.65 Lbs.

I printed this at 0.2 mm layer height with 15% infill and 6 perimeters. I put them up using drywall anchors but ideally, you could hit a stud.

Links to what I used: *Shopping Cart *#8-10 White Ribbed Plastic Anchors with Screws