All inverters that are designed for permanent installation in an RV will have a permanent connection for power that goes through an automatic or manual transfer switch, since that is part of the electrical code for RV's. They often have an ATS built in, or you can get an external one. Any inverter that doesn't have this capability but only has outlets for power connection isn't designed for permanent installation/connection to the RV electrical system even though many do so. Note that the inverter must bond ground and neutral (most do but not all) and any transfer switch must pass through both hot and neutral. The inverter must be tied to chassis ground separately from battery ground.
Brian