The Delta Unifence has been around for decades and it has 2 positions, low and high. The low position is only about 1/2" off the table, the high is about 2 1/4" if my guess is correct.
With low position, the body of the fence is a few inches away from the blade which allows much easier access to smaller and more narrow strips with your fingers or a push stick. You can't see or get in there with a high fence and you have less control.
You can make an "L" fence which clamps to any fence to create a low fence:" From another thread I started:
The difference in performance between the two is minimal EXCEPT for this. The Unifence bar is removable and is capable of a high and low fence height. The low height, about 1/2" allows your hand/fingers to get down closer to the table, in between the blade and fence. Sounds dangerous, but it's not really in my opinion.
Narrow strips can be better managed with a push shoe or your hands and you have greater control. When the fence is tall like a Biesemeyer, you must
use a push shoe to move the workpiece forward, OR use another sacrificial scrap to back against the work.
I recommend the use of a splitter to prevent the work from coming away from the fence behind the blade and causing a kickback. The most common reason for a "splitter" is to prevent the work from closing on the back of the blade when it's rotating and getting propelled back toward the operator. So, it really prevents both types of kickback. If you don't have one, get one or make one.
You can make your own "low" profile fence with 2 pieces of straight parallel edge scrap. Screw them together making a "L" which you can clamp to the Biesemeyer fence: Attached Thumbnails