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Like wrote rahmansunbeam, is hard to say and recommend a right process , perhaps other idea is that you ask to solar panel specialist and together define many factor and variable and the influences that each one have in the suitable places selection, generally the Multicriteria analysis need of interaction of a lot specialist.... is easy if understand the proceso , the how to, for select the suitable places for a solar panel.... good luck regards .

There are no 'best option' for MCDM. Each method has their own pros and cons. Try with something simpler, ie. AHP.