Wine bottles that are corked need to be preserved in a horizontal position, this will ensure that the corks do not shrink and keep moist, allowing air into the bottle will ruin the wine. So wine storage racks with slots of mini tunnels in to which the bottles of wine can be put in to a side position is the optimum choice when the wine is to remain in them long term. If the bottles are sealed with wax, you should store them in a vertical state to ensure they do not leak any of the wine out.