Fitting Cabinet lighting to cabs

Hi,

I've bought these for my cabinets

https://www.screwfix.com/p/sylvania...Vxp3tCh1QUQ5vEAYYASABEgLQnPD_BwE&gclsrc=aw.ds

I'll be honest i've only browsed at the install kit, but I'm a bit reluctant to screw them in.

Is it advisable to screw them in to the bottom of the...

Fitting Cabinet lighting to cabs