Hi Sindered,
The foundations that Brooklyn Bedding suggests are listed here.
The first post in this thread (see here) also includes links to many options that would be suitable for any foam mattress depending on your circumstances and preferences (do you want storage, extra height etc). If the mattress is all latex (or latex on the bottom layer) then a gap between the slats of 3" or less or a more closely spaced wire grid (preferably with a tight cover over the wire grid to help prevent sagging into the spaces) would be the best choice. If the mattress has polyfoam in the base layer then wider gaps between the slats (in the foundation or a platform bed) or a wire grid foundation with a larger grid pattern would also be fine.
Phoenix