If there is existing concrete to attach to, then surface mounting would be easiest. The concrete could also be core-drilled for embedding the ends of the rack. On new construction, either option would work. If the surface area is loose ground, gravel or pavers, then the in-ground mount is recommended. If attaching to asphalt, then surface mounting is an option, using lag shields for the anchors, or core-drilling for embedding the ends of the rack.