I say "Yes" to Monoblock if it suits your need.
I have lots of monoblocks. I like these Marantz MA-500, got a bunch of them for cheap, and they can be slipped into different places. I
heard the individual monoblocks test better than the 5-channel single-chassis equivalent, I have no idea if true. I can bridge pairs, so additional flexibility over some multi-channel amps. In my case, one going bad doesn't reduce the use of the 5-channel amp. And I had to recap two, but I have fifteen of them. They were an estate find from a home theater for $750.
The Hypex DIY and March PuriFi amps are also monoblocks.
As are these 7B ST monoblocks. They power the subwoofers for a pair of active monitors. I could do the same
So, if you are going to be an amp-hoarder, monoblock is not a bad way to go. Stereo is great too, especially many stereo can be bridged... so long as they are intrinsically stable at low impedance/high current. Like a bunch of Benchmark amps would be so useful.

I guess I am a little hesitant about multi-channel amps, even if it is typically cheaper per channel all other things equal. I doubt that a proper multi-channel gives up much performance to monoblocks. If I consistently needed a 3- or 5-channel amp I would consider one if it was a good value.