They aren't the right approach for docks.
For a houseboat, possibly. Depends on what the side of the houseboat looks like.
Carry these for rafting to other boats, and get some good 8-10" diameter standard fenders for tying up to docks.
There isn't 1 solution that works everywhere.
If the houseboat was mine, i'd go old school wiht some hard mounted bumpers, or old tires with some sort of cloth cover.