Stanbroil LP Propane Gas Fire Pit Stainless Steel Burner Ring Installation Kit, 12-inch

I purchased this ring and regulator kit and it whistles loudly during operation, additionally it doesn't seem to work very well at lower settings.

can I connect an additional 40 feet of hose to existing connector coupling to reach my main propane tank?

Isn't this supposed to have a pan? or how is the ring mounted?

Do you sell a Key valve extender to allow the valve to be set in a paver block