Hi Raistlin,
There is more information in post #10 here about choosing a steel bedframe but if you are considering a latex mattress (which can be very heavy) I would tend to choose a more heavy duty foundation that is likely to be more stable and have a stronger design to support the weight of the foundation, a heavy latex mattress, and the people sleeping on the mattress.
The bedframe you are looking at is probably this one from Leggett & Platt and as you can see it’s their “promotional” bedframe and I would look for something stronger where the angle iron was 1.5" wide or better rather than 1 1/4".
Phoenix