I have a multi-flap single louver, it works perfectly.
Basically this style [though I got mine on amazon]:
https://www.homedepot.com/p/Everbilt-4-in-x-8-ft-Louvered-Dryer-Vent-Kit-TD48PVKHD6/203626525
I also just upgraded (literally today) to an insulated exhaust hose, it is so much quieter now.