I have one of the blue ones for a 7m rib, and can put it on, straps and all whilst on the water, bit fidly, but feeding it on from the bow to stern, with the straps clipped in place can work, then just tighten when all in place.
Guess it could be a bit more fiddly on a smaller rib, but if it's on a mooring, I guess you have a tender to get you out there?
There is another supplier on ebay, that does not advertise under ribs.
They have an elasticated hem, and straps. Just phone before you buy one if you go this route, they had a batch of lower duty material, that was not good enough imo.