They can work, if there is a good place to mount them so they can be "cleaned" at least occasionally.
I went with the Dimples magnetic drain plugs all around. Very strong magnets and serviceable with every fluid change. http://magneticdrainplugs.co/
2007 GearUp (Arctic #1)
130/45 jets, KTM rock solid mirrors, Delaware Dave's outstanding trunk lock, Mr. Cob's most excellent skid plate, Cycra Probend smashproof hand guards, Duro strong like bull 307's, RotoPax damn near bulletproof fuel cans, MKIII all but water proof air box and Dimples super duper magnetic drain plugs all around...oh yeah, and a manual fuel petcock.
.........if you see something that needs doing, just do it........