They re typically placed on the stud line.
How to hang heavy items on a stud wall.
Check for nails along your baseboard.
Knock on the wall when you re over a stud the sound will be a more solid thump.
Back out that bit and insert one.
You can hang heavy items in plaster walls without driving screws into a stud.
When you meet resistance after drilling 1 2 inch you ve hit the stud.
Some prior knowledge of the existing materials thickness of the drywall gauge of metal studs and spacing of metal studs will aid in determining the best mounting methods.
As with the expansion anchor drive it in until it sits flush with the drywall.
Use a stud finder which you can buy at your local hardware store.
Start by drilling a hole about the size of the tip of the threaded anchor.
If you find a stud mark the spot on the wall.
Using toggle bolts is a common way to anchor heavy objects into steel studs.
Mark the wall with a pencil and move the stud finder approximately 16 or up to 24 to the right or left to find the next stud.
Using a small drill bit drill into the first mark.
Then take your power drill and drive the threaded anchor into the drywall just like you would with a normal screw.
For best results heavy objects should be mounted to as many metal studs as possible so that the weight will be evenly distributed.