Fastener retainer brackets and related assemblies and methods are disclosed. One example fastener retainer bracket includes a mounting portion and a restricting portion coupled to the mounting portion. The mounting portion defines a plurality of openings structured to receive a plurality of fasteners received in a support structure. The restricting portion is adapted to permit tool access to heads of the plurality of fasteners when the plurality of fasteners extend through the plurality of openings of the mounting portion. The restricting portion is adapted to contact the head of at least one of the fasteners to inhibit removal of that fastener from the support structure.