Used this in my garage to store my 14’ kayak. Keeps the boat on its side, suspended by the straps to minimize any permanent indents to your boat. It’s a fantastic rack, I just sold my boat and I no longer need it. Four screws 1/4" x 3-1/4" in size came with the rack that are not included that are needed for mounting.

https://www.rei.com/product/103772/suspenz-deluxe-boat-rack