You can install a PWC lift anywhere you have an anchor point to ensure it won't float away. Jet ski lifts can be installed along the shore, attached to docks or even placed in marinas (check with your local harbormaster to ensure compliance). All you need is enough water depth for the draft of your PWC to approach the floating jet ski dock. PWC docks work in shallow, deep and tide-affected areas with proper hardware and installation. You could even place a jet ski dock in the middle of a lake as an artificial island with the proper moorings.