That's a tough one. It is either suspended/supported by something physical. I'm more likely to accept the suspended idea. Or, it is something else. Something I don't think FE logic allows for is accepting the "I don't Know Yet" answer. Conventional Sciences are very good at admitting what the limits of their understanding is. They say, while we do not know what causes the force of gravity, we can measure it. Fringe physics (regardless of if it's Flat Earth or something else) falls victim to needing to have an answer for all aspects. Hence the reason there are 15 different FE models.... I think there would be more power in them saying, this is the model that mostly fits with our observances and these are the areas that we do not have a clear understanding on yet...
I see this in conventional science... They observe the Big Bang Model as a more or less Truth... But the Big Bang event they can't prove... Ya know what I mean Bra'?