Hi debating,
Zoning systems can sometimes be very useful and worth considering for people who have more challenging circumstances or sensitivities, body types that are more difficult to “match” to a mattress, more complex medical issues, or who have a history of having more difficulty in finding a mattress that works well for them. There is more about zoning in this article and in post #11 here and the additional posts it links to.
Latex is also heavy and “sticky” and tends to stay in place inside a suitable tight fitting cover so there isn’t generally any issue with the latex shifting.
The only reliable way to know whether a zoned mattress would be a better “match” for you in terms of PPP than another mattress that either isn’t zoned or has a different zoning configuration will be based on your own careful testing and personal experience.
There is more about Plasmabed and SleepMart in post #2 here and in this topic along with the other posts and the forum search it links to that may be helpful. I would always make sure that any retailer or manufacturer you are dealing with can provide you with all the information listed here about the materials and components inside their mattress before considering any purchase.
While a latex allergy is certainly possible … it would be normally be to the dipped latex that is used in gloves, balloons, and condoms etc and it would be very unusual with foamed latex because it is washed and it would usually require direct physical contact with the latex itself without a cover over the latex. There is more about latex allergies and sensitivities in post #2 here.
If you are referring to a split layer mattress where the split layers are inside a single cover then you can see some comments about the pros and cons of a side to side split in post #2 here.
If you are referring to having two separate mattresses (such as two twin XL mattresses to make up a king size) then there are some comments in post #8 here and in this topic about the pros and cons of a split king mattress.
Phoenix