You can do much better than that in TN. A 10k spec for a group of 100 (if it were even available) would be so expensive that it would not be worth it. You could do a risk-sharing captive or some other strategy that would be much less costly.
I'm aware of that and have gone behind to clean up enough self funding messes to not really believe in self funding until upwards of 1000 members, not employees. Claims are only ~ 65% credible even at 800 members.
(I don't care that carriers are willing to sell the plans or assign 100% credibility on smaller groups. The arithmetic deck is stacked in carrier's favor.)