About 20 years back, I ran an all Magnepan 7 channel with subs system and I had an Acurus A125x5 running low end on my 3.5R’s. I had Levinson 23.5 for highs. It was glorious. 2.5R at sides and 1.6 for rears. Balance of amplification was SimAudio Moon 2 channel. Processing by Lexicon. Miss it deeply.
So I’ve done it it full range on 2.5R and bass for 3.5R with 125wpc from one 5 channel Acurus amplifier. You are very safe here.