Most markers and brush pens have a double tip, i.e. there is a fine liner on one side and a kind of brush on the other. To ensure that neither side dries out, it is advisable to store them horizontally.
We have developed a product that has two functions. If you want to store the pens, you can do so horizontally. And the pens don't dry out. However, if you want to use the pens, you can lay it horizontally on the table and thus have a very easy overview and can quickly reach all the pens.