Hi Bunny1999,
Most retailers or manufacturers that sell latex mattresses would also sell a suitable foundation but if for some reason they don’t then you would need to buy it separately.
Yes … An all latex mattress will generally do best with a firm, flat, and evenly supportive support surface underneath it that has minimal to no flex under the mattress and for larger sizes with at least one center support beam that has good support to the floor to prevent any sagging in the middle of the mattress. The components need to be strong and durable and stable enough to support the weight of the mattress and the people sleeping on it without some of the parts bending, sagging, or breaking over time. The support surface under the mattress should have enough surface area to prevent the mattress from sagging through any gaps or spaces in the support surface over time but still allow some airflow under the mattress. I would suggest that in a slatted support system (either a foundation on a steel or wooden bedframe or a platform bed with a slatted support surface) that any gaps between the slats are no more than 3" (with 1 x 3 slats) although less than that would be better yet.
Latex can oxidize faster with exposure to air and ozone and ultraviolet light along with other substances that can damage it see here and it’s generally a good idea for latex to have a suitable dedicated cover to give it the best possible protection and to help maximize it’s useful lifetime. It can also help protect it with handling. There is more in post #3 here and post #3 here that will give you some sense of the effect of different types of covers on latex. A cover would have “some” effect on the feel of the topper but a relatively thin stretchy knit cover would have the least possible effect.
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Phoenix