I hadn’t either. And now I know why. 
I was aware Asus had a larger portfolio than ASRock or MSI but hadn’t realized by how much. And Gigabyte has so many versions and variants.
If you don’t want to switch PEG there’s actually six X870[E]s. A problem either way is the additional CPU M.2s end up under a dGPU, so are limited to armor for heatsinking and get exhaust heating. IOPSy things are likely slow enough armor’s adequate if rebuilt for thermal contact but most drives require active cooling not to void their warranties by exceeding their operating temperature ratings under sustained activity at high PCIe 4.0 x4 utilization.
So its placement makes M.2_2 on B850 Tomahawk, X870 Tomahawk, X870E Tomahawk, and X870E Edge useless for my purposes (also X870E Godlike as the fifth MSI board but no way am I buying that). Same problem with X870E Carbon and all the other X870Es I’ve looked at with x4 out of PEG. Also B850 Pro RS, Edge, and Aorus Elite AX V2 along with B650E TUF. B850 Aorus Elite is worse as it puts both CPU M.2s under the dGPU.
For thermally unrestricted and GPU friendly M.2s on midrange and upper boards it seems to be just
| GPU clearance | boards |
|---|---|
| 2.3 slots | B850 Steel Legend, B850 Riptide |
| 2.5ish slots | Prime X670E-PRO |
| 3 slots | B850 Pro-P, B850 Gaming Plus |
| 4 slots | B650 Steel Legend, B650 Riptide |
| B650 Tomahawk, B650 Edge | |
| B850 TUF |
with B650 Steel Legend typically being lowest price if it’s in stock here (at the moment B650 Tomahawk’s a tie, which is unusually low for it).