With the older FO models the D-rings on either side were not really for single anchor I think if you added a handle pass loop between the two you might be ok but I did contact FO a few years ago to check and they advised that they were not for single point attachment, now they come with a handle pass loop.....!!!!
So if you are not sure double check with the manufacturer........ ;)
Well done guys lets keep looking after each other ;)