Hi mattressseeker,
Most steel bedframes are in the range of 7" - 7.5" high so in combination with a suitable 8" to 9" foundation you would have a support surface under the mattress that was somewhere between 15" and 16.5".
I would generally suggest a slatted wood foundation that had a rigid non flexing surface with no more than 3" gaps between the slats (and preferably less). There is more about foundations that are suitable for different types of mattresses and some sources for each of them in the foundation post here.
There are also some steel foundations which have a wire grid support surface but these can be a little more risky with an all latex mattress because the gaps between the wires are wider and there is less support surface which may allow the latex to sink between the gaps to some degree in longer term use (see post #10 here). Some of these are combination platform bedframes that are 14" high with storage space underneath and replace a steel bedframe and foundation but if you were to use one of these with an all latex mattress I would tend to use a bedrug or a layer of firm polyfoam on top of it to help even out the support surface and to make sure the latex doesn’t sink into the gaps over time.
You are well inside a weight range where 10" of latex would easily be “enough” and you certainly wouldn’t be bottoming out but depending on the design and layering you may still prefer a thicker mattress even though you wouldn’t “need” it.
Phoenix