I went tubeless last year too, and I am soooo glad I did. First on my gravel bike, then the road bike, and I’ve had one puncture in 10,000km between both bikes, and that was a large hunk of metal that gashed the sidewall right near the rim.
Anyway, I have the Road Machine too, and tubeless is not a problem. Since the fall, though, I’ve ditched the RM for the InsideRide rollers, again with no problems.
Well… one problem. In the middle of a TR session, I heard a hiss coming from the back wheel, and I expected to dismount and find white goop all over the living room. Turns out the valve stem had worked its way through the rim bed. How? Likely because it was a Stan’s stem with the little round rubber mushroom top combined with rims that the manufacturer recommends NOT running tubeless.
I changed out to Orange Seal stems that have a big square mushroom, and no problems since.
So in my experience, tubeless works fine on trainers.