How does the minimum ticket size change under a roll-up thesis?

I've commonly heard that common Revenue / EBITDA criteria in usually $10M / $1M respectively. Does this criteria still hold true under a roll-up thesis? Specifically thinking of all the examples of business services / personal service roll-ups where intuitively / outside in, the Revenue/EBITDA seems to be lower (e.g., think botox clinics, beauty salons).

Does anyone have any experience with smaller ticket size investments specifically under the roll-up model? If so, I would appreciate any 1) advice on how to think about it, and 2) how to approach the investor conversations, as well as 3) what type of conversation / push back to expect.