I am very pleased with these heaters.  I installed the stationary mounting bracket on the inside face of the upright outer support posts of my deck overhang, so the unit would face inward and direct heat across my deck seating and toward the exterior wall of my house.  The bracket on each heater unit drops right into the stationary mounting bracket, providing a very solid installation yet making it easy to simply lift the units out of the bracket and take them inside for storage.   They come with a plug and a cord long enough to reach down to a regular house electrical outlet, but NOTE that each unit draws 1500 watts so you'll need a dedicated circuit of at least 20 amps for each one to avoid tripping a breaker.