window manager that is wayland based

The term you want is "compositor" rather than "window manager". Under Wayland, the relatively-modest role of the X11 window manager has been replaced by the larger compositor, which does a superset of what window managers did.

I don’t really want to install a plugin to make it autotile

I don't know what "autotiling" is. Looking online, I see various people using the term for different things. A script for sway uses this term and states that it automatically-selects between horizontal or vertical splitting orientation based on the currently-focused window dimensions. Is this the functionality that you're asking for?