You can add multiple products to Product Push, there is no limit.
However, please be careful not to Product Push to many products. Tweakwise's power lays in the fact that products can be sorted automatically based on rules. This should result in having to spend less time sorting products. Once you start sorting everything manually, you'll have more work on your hands. Our advice is to manually sort a maximum of the first two rows of a category in your shop, and only if you really need to. If you can't work it out, you can always contact us at [email protected] so that we can help you figure out the best way to do it.