Anchors, toggle bolts, molly bolts, they all should work. I've used (and am currently using) them to hold up my QS8s. Have been doing so for about 8 years in 3 different installs without issue.

OR

Just use a regular drill bit and drill into the metal studs.

OR

Just use "self tapping" metal (not wood) screws and they should pull themselves right into the metal stud.

Personally, the toggle/molly bolts are my favorite way. VERY secure.

Farewell - June 4, 2020