We have lease
seabed for three moorings in the BVI. You need to apply to the ministry of natural resources in the BVI listing the specifics and, usually, either own a business or property there in order to get one. Be prepared for a long and drawn out application process. Although we do not have a USVI mooring
I do know from friends that locals in STT/STJ/STX can be very territorial about their seabed, especially seabed they consider "family property"; while technically you could lease
your mooring almost anywhere, be prepared for it to go missing on a regular basis if you are new to the territory.