Just a couple of notes on the horizontal rub. I think the main reason I have success with bucks hitting mine where others don't is the fact I use scotch pine limbs as the rub and keep the limb fresh. Once they dry out bucks are much less likely to work them i.e. Bucks don't rub dead trees.
The reason I place them horizontally is I think it's just easier for them to work. They can stand and rub back and forth on it with little effort. Most will rub abit then stop and smell or nibble at the bark then rub it some more.
As for placement I like to setup mine in heavy cover because that is where a big buck will feel most secure and therefore more likely to work one in daylight. They do work great on food plots also you just need the buck to come out before dark.
The licking branch added to the setup just gives a buck another option to work and leave his scent mark he can also paw the dirt under the branch if he desires. Just like a regular scrape. I've found red oak branches work best in my area for this.
Really I'm just giving a buck everything he needs to make a signpost but in the place I desire.
Hope this helps. Ted