Nope - it'll be fine
Once they're set up, and if the nut is slidey enough, the xtender should work as you hope it would. a sticky nut can cause it to not behave and you need to ensure the little adjustment screw on the xtender is set correctly
Its dead easy to fit if you buy the correct type that corresponds to the bass's existing tuners. just take the string off the E tuner, unscrew and remove the tuner, fit the xtender using the screws that come with the xtender.
A little dab of vaseline on the xtender goes a long way and keeps it working smoothly. Also if you don'r have a graphtec nut, some pencil graphite in the nut slot helps keep the string moving smoothly in the slot.