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> I was under the impression every M-based

That’s the “base” M1/M2. The M Pro supports 2, and the M Max 4, up to 6k (except for the 4th display on the Max, because HDMI).

M2P is also limited to a single display if you need 8K (not sure the M1P supported that at all).

It's only the air that is limited to a single monitor. I have an m1 pro and it's running two monitors daily. 4k, one 32:9 1440p ultrawide

14 inch M1 Pro supports two external displays, 14 inch M1 Max Supports four, all four can be 5K.

Sadly, Apple knows exactly how to get my money from me.

> all four can be 5K.

Only 3, the HDMI out is limited to 4K.

Shoot you are right, they are port limited on the fourth display. (as the M1 Max has double the hardware from the M1 Pro so one can assume it can support quad 5K, but it has only three Thunderbolt 4.)

I am running two Studio Displays off of my M1 Pro 14-inch

Yes. Source: Runs an M1 14" Pro on 2 monitors.