I've not built one but I've seen several approaches to supporting the model.
In general anything solid underneath will help. This could be a metal rod (or several) hidden within rubble/buildings; or a clear flight stand hidden within trees/bushes.
Heck I know at least one person even went as far as to drill out the legs to put metal inside them but that is a very demanding (and risk prone) approach to strengthening the model.
As for height, because of the vagaries of resin it might be easier to construct yours and then construct support for it. Slight variations in how you glue it together and in how much flex there is in the resin legs could mean that the height one person has it at is a little different from another.
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