Mounting frame for 3-gang sockets not secure enough

[Parabola]

Apologies for the naive question but I'm trying to mount x3 CBE sockets onto a C-Line mounting frame. The problem is that each aperture only has two clips (yellow) to secure the socket meaning they just pop back out when applying the slightest amount of force. Not sure if I should glue the sockets or look for another solution?

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[BikerPa]

IME these are merely locating lugs with a bit of play.
The outer trim frame comes off (arrowed) to allow the inner triple frame to be screwed (circled) to whatever surface you arre mounting to.
This allowws for the round cutouts for the 3 sockets/switches to not be perfectly aligned

 

[Parabola]

IME these are merely locating lugs with a bit of play.
The outer trim frame comes off (arrowed) to allow the inner triple frame to be screwed (circled) to whatever surface you arre mounting to.
This allowws for the round cutouts for the 3 sockets/switches to not be perfectly aligned

View attachment 262907

Ahhhh perfect! Thanks, that makes much more sense!