I bent the ends and locked in place with small cable ties.
Didn't have an issue with them coming off.

If you have the heated bed then you don't need to mess about with topographical mapping (it's NOT levelling)
Just keep doing the g29 and adjust the three levelling screws until the three numbers are within a few 100ths of a mm.

Then use the control panel to zero z - and that's the entire levelling process. Plus it actually physically levels the bed, the weird way maps the surface.

Yep they do make a pleasant noise.