A flange adapter can include a plurality of walls, with at least one wall being an overlapping wall. The overlapping wall can include multiple layers formed from overlapping folded sections extending from at least two other walls, or from overlapping extensions of at least two other walls. The overlapping wall can receive a fastener through the multiple layers to secure a support structure to the flange adapter. A main body of the flange adapter, including the plurality of walls, can be integrally formed from a single-piece of material.