Question about fountains

I have a new fountain attachment that connects to a jet to send water out and back into the pool. Instructions to attach is removed the nozzle in the jet and attach the fitting on the fountain. Seems pretty straightforward and reason for us to hopefully cool the water a few degrees during these hot summer days.

My concern is if someone were to grab the fountain, pull up on it, fall and grab for support, etc how much risk to damage do I have to the plumbing feeding the jet? I have an in-ground fiberglass pool.