Those were meant for optional attachments, I've only ever seen a light weight cultivator attached to those points.
No they are not strong points for mounting a BH mount.
The BH subframes for these models extends from the rear center Hitch mounts to the sides of the bellhousing and onward to the front frame.
Do you already have a loader with it's subframe and axle bars?
The number one issue that happens with these models is that they get broken in half from stress.