Some more caveats:
Your right to remain silent, or invoke Miranda, applies to questioning while in custody - a custodial interrogation.
The courts generally hold that you are not necessarily in custody just because you are detained. Detained means not free to leave, in custody means secured formally akin to arrest, as when placed in handcuffs or put into a secure room.
So, while you are detained when pulled over on the side of the road, you are not in custody, and are therefore usually not entitled to a Miranda warning before being questioned.
Meaning, the cop may start asking you questions before advising you of Miranda, and your answers will be deemed voluntary and not the product of an interrogation. (“Where you coming from tonight?” “The bar that Kayaker likes”. “Drink any?” “Only 2. It’s always only 2.”)
Also, Miranda is not held to apply to physical movements. So even if you did invoke Miranda, your performance on the FSTs may still be admissible, and there is no obligation for the cops to Mirandize you before asking you to do them.
This is why you have to (politely) decline when the cop tries to cajole you into doing tests:
“I just want to check your eyes to make sure that you’re ok to drive?”
“No thank you.”
“You won’t do tests to dispel my suspicion that you may be too impaired to drive?”
“Nope.”
“You said that you were fine. So it shouldn’t be a big deal. Once you pass them, you can head home.”
“I don’t wanna.”
“Well then I’m forced to make an arrest decision based on the signs of impairment I’ve seen so far. I detect an odor of alcohol, you were speeding, and your eyes seek glossy.”
“It’s 2 am. I’m tired. I just want to go home and I won’t do any more tests.”
“Then put your hands behind your back. You’re under arrest for DUI. Do you have anything in your pockets that may stick or poke me?”