Yes, the topic of combining valves with solid-state, which and where, has a long history without coming to firm rules or even guidelines. No guaranteed synergy without getting to specific models. Any direction would seem properly driven by speaker choice. And to some extent music - that's full orchestral in my room.
I've only heard the Soulution amps with Magico and (of all choices) Verity. For a while (way back) I was all solid-state, then all tube for many years (CJ, Atma-Sphere). At this point I'm living with ARC 10's up front and the Lamm SS amps. The strengths of each seem to will out with the speakers I have. Room (17x20) is too smal for larger horns. BUT the all Lamm system currently in play is
very easy on my ears.
I don't know if Mr. Lamm has thought about it, or even if its possible in theory, to bridge two M1.2s, but I'd listen to 'em.