I've seen that extender. What if worry about, unless it comes with an extra long curtain, is that the extender will make will the curtain too short and waste will get out even more than it does now.
2016 Roo 21SS
2005 Ford Excursion-Sherman
Mods so far:
PI hardwired EMC, Wire Shelving in wardrobe
Plexiglass screen door protector, Blue LED Wine nook
stairs, and counting...