I've got a 150mm dropper in my 2020 Jam² 6.7 Nine. Couldn't handle any more than that because I've not got the inside leg to cope with it. There is only a couple of centimetres of post above the seat tube.
I have a 2019 SAM2 in S size and I wanted a better drop and I went for a 150mm OneUP V2 dropper post. Works great and fits the small frame well. OneUp make the shortest seta droppers.