I have fence company installing a retaining wall 2' tall and a fence.
They have done retaining walls before and seem to know what they are
doing, but they are setting the prefab stones at ground level (they
flattened and leveled even with sidewalk) with crushed rock on top
rather than dig down 3" + gravel as per the instructions of
mutualmaterial.com states for manorstones. When questioned, owner
said they will put dirt in front (wall inset from sidewalk a foot).

They just finished first day and got ground level and just started
putting blocks in. Quick recommendation/help appreciated.

Thanks,
Clayton