RBA / RCA / RDA mounts are fully captive isolators that can work in any orientation.
Rubber isolators have to be compressed in order to isolate. In the majority of situations rubber is compressed by gravity load, from a floor, wall or piece of equipment. Therefore normal isolators are only rated for vertical loading.
This range of products compresses the rubber element within a metal housing. The rubber is compressed in all directions which allows these to have a load rating in all axes. These mounts can be used in any orientation and the larger sizes can handle significant loads.