When it comes to mattresses and wood slats, there are a few things to keep in mind. First, while you can put a mattress directly on wood slats, it's important to make sure that the slats are spaced evenly and are no more than 3-4 inches apart. This will ensure that your mattress has the support it needs and that you won't feel any uncomfortable pressure points. Additionally, you'll want to make sure that the wood slats are covered with a cloth or something similar to prevent the mattress from slipping. Finally, if you have any concerns about your mattress warranty, be sure to check with the manufacturer before putting your mattress directly on wood slats.