I have a place I'd like to mount my M2 speaker using the "full metal bracket", but there isn't a stud.

Do I need to mount it into a stud, or can I use the toggle brackets that put a little metal bar behind the wall? The one I have is rated 100lbs on the wall, 50 lbs on the ceiling for 1/2" drywall.

I can mount in stud if I have to but would prefer not.

I could also paint a little block of poplar or something and mount the bracket to that then mount that to the wall to give better leverage.

Any ideas welcome. Thanks in advance!