Idiot Steve, here.

Kenny, my experience was in a rose greenhouse. Those plants were grown in the floor. After nearly a century of growing in that ground, my understanding is that they began going hydroponic. Something about concrete and peat . . .

I think that smaller greenhouse growers could go the same way as container growers with their tomatoes. The size requirements should be about the same.

What is commonly done commercially, I don't know. Attached is greenhouse growers guide from Purdue on the subject.

Steve

Here is a link that might be useful: Greenhouse Tomato Handbook, 30 page pdf