I installed two of the large cubbies in my van. They ship flat and disassembled. Assembly takes about 3 minutes with an end wrench. I used wood screws to screw straight to the floor. They are great at keeping the odds and ends/loose stuff contained.
Just received my wheel well cubby. It’s great quality and super easy to install. It goes well with the pullout drawer as well.
More durable than I expected. These are going to be great for storage on one side of the van and power system housing on the other side.