Your best bet would be anything that has the performance you're seeking that runs or can be flashed with 'pure' OpenWrt... like a Flint v1 ('GL.iNet GL-AX1800' on the 'SNAPSHOT' series) or a Beryl AX (has a 2.5GbE port) ('GL.iNet GL-MT3000' also on 'SNAPSHOT'). You can find various wall mounts for the Beryl AX on one of the 3-D print plan web sites like thingiverse.
The Slate Plus (GL-A1300) has OpenWrt support since v24.10, IIRC.
Pure OWRT will guarantee the flexibility to re-assign the WAN port for LAN back haul & much, much more. I haven't tried GL's implementation of AP mode myself but you can always flash back to GL.iNet firmware & set that up as long as you have U-boot. Check the GL.iNet docs for 'How to unbrick your router via U-boot' (or similar terminology) & 'Network Mode'.
(IMPORTANT: only use the sysupgrade to upgrade from the GL GUI to keep U-boot on the device!)
See OWRT's table(s) of hardware: openwrt.org / supported_devices
FOLLOW-UP: GL.iNet firmware supports both changing the WAN to a LAN port & AP mode. If hardware performance is more important than OWRT's general flexibilty, the new Slate 7's (2) 2.5 GbE ports & increased Wi-Fi rates is worth evaluating.