A way to get around the perching problem is to do as you mentioned, hang something over it in a way they cannot get up there to perch.
Board is 'hinged' with wires, hook above to hold it if necessary.
I just add a heater and insulation in winter.
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A way to get around the perching problem is to do as you mentioned, hang something over it in a way they cannot get up there to perch.