Hi Imyyap,
Zinus mattresses tend to use lower quality/density materials than I would be comfortable with in terms of the durability and useful life of the mattress and they are also made in China which would also add some additional risk as well (see post #6 here).
IMO … you would have better quality/value options available to you than purchasing a high quality topper and putting it on top of such a low quality mattress but of course these are choices that only each person can make for themselves.
Outside of any potential durability issues though … I hope that the combination works well for you.
Phoenix