wat i usually do is put a strip of 3M trim double sided mounting tape
on the panel or metal (clean with alcohol before app), place the wires
on the mounting tape, adjust as necessary, then place 3M e-tape over
the wires and the mounting tape so that the adhesives stick to each other.
it secures it very well, yet it's removable... vibration free, and no
need to zip tie anything.
if it's a small wire you can use 3M e-tape and just tape it over the
wire completely so that the adhesive side stick to each other, then
stick the 2 loose adhesive ends of the same tape onto the panel.