To be honest, for my very occasionally used MTB, I'm thinking of going back to tubes (or even tubes with tube compatible sealant in em). Every time I go to look at my MTB, the rear tyre has deflated, and become unseated. This is despite using a proper tubeless compatible tyre, and a tubeless conversion kit, and a "pool noodle" tubeless tyre liner... Or even go for something like Schwalbe Smart Sam Plus, which has the same thick puncture resistant layer as Marathon Plus tyres.....