A potential problem of the presented protocol is connected to the non-locality of strong (static) correlation. The FEH model implies that strong correlation effects are localized within the monomers and the coupling between monomers can be approximated using a one-particle excitonic basis. One can indeed expect such a situation in organic dyes where the exchange coupling can be negligible in particular for larger distances. However, it excludes magnetic systems, e.g., based on transition metal complexes, from consideration, as in these cases exchange (and superexchange) interactions in the valence states could lead to pronounced delocalized electron correlation. This might, nevertheless, be not the case for core excitations in multicenter transition metal complexes.