Re "I can't believe it's not nails", as with other brands it's available as a solvent-based version and a non-solvent-based version. For a Dell case, you should use a solvent-based adhesive since the non-solvent-based version requires one surface to be porous.
On my own ABS case I used a liquid methyl ethyl ketone, which I simply brushed on and let it wick into the cracks around the USB ports. It seems to have worked fine.
Having said all that, a cheap UHU general-purpose would do the job just fine.