It almost never comes down to acting ability. It comes down to three mechanical things, all of which you can fix in about ten minutes.
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A teleprompter read looks obvious for three fixable reasons: the script sits too far from the lens, the scroll pace does not match how the speaker actually talks, and the script is written as prose rather than speech. Fixing the placement first has the biggest effect.
A teleprompter puts your script close to the lens so you can read it while appearing to look at the camera. That is the whole mechanism. Newsreaders, politicians, and everyone you have ever watched deliver something flawlessly are all doing exactly this, and the only difference between them and you is how close the words are to the glass.
The further the script sits from the lens, the wider the angle between where your eyes are pointed and where the camera is. Get it as close as the rig physically allows. If you can only fix one thing, fix this one, because it is worth more than the other two put together.
A speed that does not match how you actually talk makes your eyes dart ahead or fall behind, hunting for your place. That hunting is what people are seeing when they say something looks read. Let the script follow your voice and it disappears.
Prose does not survive being spoken. Long sentences, formal connectors, passive constructions. All of it sounds stiff out loud no matter how well you deliver it, and no amount of good placement will save a sentence that nobody would ever actually say.
Short sentences. Contractions. Say "you", not "one". Read every line out loud before it goes in, and if you stumble over it at your desk, rewrite it, because you will definitely stumble over it on camera.
Directly below it. Touching the camera housing if your rig allows. If you are using the camera-behind-script setup, this is already solved, because you are literally looking at the lens.
If you move your head towards the screen, it is too small. Around 48 to 56 px at arm's length. Narrow the column so each line is five to eight words, which stops your eyes travelling sideways.
Voice Follow means the script moves at your speed rather than a number you guessed earlier. If you are on smooth scroll instead, pick a speed you are comfortable with and stop fiddling with it, because the reach is visible.
At normal size, not zoomed in. Zooming in exaggerates eye movements nobody can see at actual viewing distance, and you will end up fixing things that were never broken.
Here is something that sounds like superstition and is not. People who know they can recover from a mistake cleanly make fewer mistakes. If a fluffed line means restarting the whole take, every sentence carries a bit of dread, and dread makes you fluff lines.
Mark your script with sections. Then a stumble means jumping to the top of that block and going again, with everything before it still good. The pressure drops, and so does the error rate. It is the most reliable delivery improvement available and it takes about ninety seconds to set up.
Usually three things at once: the script is too far from the lens, the pace does not match how they talk so their eyes are hunting, and the script was written as prose rather than speech. Fixing the placement helps most.
As close as your setup physically allows. Directly below the lens. A camera-behind-script setup solves it entirely, because you are looking at the lens while you read.
Around 48 to 56 px at arm's length, with the column narrow enough that each line holds five to eight words. If you have to lean in, it is too small.
No. A phone or laptop you already own is fine. A glass rig improves the angle further but is unnecessary for almost everything most people shoot.
Mark your script into sections. Knowing you can jump back and retake one block rather than restarting the whole thing takes the pressure off every sentence, and less pressure means fewer stumbles.