Niki Weber and J.P. Guiseppi were booted from their rental in Venice, California, with only a month’s notice. In the frantic search that followed, the pair bought the first property they visited: a hillside residence in the Silver Lake neighborhood of L.A. The plot had enough space down slope to install an ADU. Putting their hard years of renting to good effect, the pair hired Cover, a Los Angeles-based start-up specializing in prefab backyard homes, to build the rental they wish they had lived in as tenants.