Molten salt sounds like a terrible design for modular, the whole problem is if it loses power it freezes solid, you'd want a huge one with tons of backup imho.

I'd imagine a tiny pebble bed or traveling wave, something fairly inert and safe.

Edit: I guess that's the point, give someone a reactor, if they screw it up it safely freezes dead. Problem solved.

There have been others building a prototype or research reactor, but the M in SMR also stands for mass-produced and nobody got even close to that.