Plasterboard anchor?

[Kerb]

I was going to install a stair railing on the wall, there were 3 pre-drilled holes and the screws were from the Habo system.
Two out of three held well in the wall, while the third ended up in an empty space, meaning only through the drywall.
The Habo screw is threaded M10 with a wood screw towards the wall.
Do you have any suggestions for the best drywall anchor or similar, considering that the two upper screws can handle the entire load so the third is relieved?

 

[fribygg]

I was going to mount a stair rail on the wall, there were 3 pre-drilled holes, and the screws were from Habo system.
Two out of three screwed well into the wall, while the third hit an empty space, just through the drywall.
The Habo screw is threaded M10 with wood screw towards the wall.
Do you have any suggestions on the best drywall anchors or similar, I believe the two upper screws can handle the entire load, so the third is less critical.

Welcome to the forum @Kerb!

Can't you move the bracket a bit and screw into a stud?

 

[Joakim_Lind]

I was going to put up a handrail on the wall, there were 3 pre-drilled holes and the screws were from Habo system. Two out of three held well in the wall whereas the third ended up in a void, meaning it only went through the drywall. The Habo screw is threaded M10 with wood screw towards the wall. Do you have any suggestions for the best drywall anchor or similar, I believe the two upper screws can handle the entire load, so the third is relieved.

If 2 are good, the last one can probably just sit with a regular plug.