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I guess it depends on your set up but from my experience, tubeless tyres are tight and really rely on the channel in the middle of the rim to allow them to be fitted and removed. I wouldn't want to be snapping tyre levers trying to get them off when you've punctured in the rain and can't get the tyre off the rim because it's too tight after 3 layers of rim tape
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I can get them on by hand now, they seat nicely (even if I have to pump to/just above the max pressure recommended for the tyre) and stay seated even without any air in them, but unseat at the first gentle push. This is all in the dry and cozy environment of my flat.
Hence my thinking of adding one more layer
I am also thinking of adding more layers of tape to make sure the setup is extra snug and won't unseat even with the tyre completely flat.. Is that stupid?