Where is the SiriusXM Bluetooth cradle? (SXBTD1V1)

Sirius XM does have an FM Direct Adapter that takes an audio signal from the dock. The car antenna lead plugs into a female socket and a male lead then feeds to the radio. When the xm radio is powered up, it feeds the signal directly to the car radio. When it's powered down, the car radio receives normal broadcast bands. The unit is FMDA25 and is available from Best Buy, Amazon and Walmart.

 

Hi...this is probably true as long as you have sufficient bandwidth to stream. Bluetooth audio generally sounds better than satellite radio.
The key reason I say probably is because I don't know if the Sirius XM streaming app streams at a higher bitrate than the satellite service. i.e. the bluetooth is better than the satellite link, but I don't know about whether the bottleneck is really Sirius XM content quality.

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While I haven't tried that specific FM adapter, others have been bad. You tune to one FM freq, but as you're driving you'll often end up with a radio station either on that freq or close enough to bleed into your adapter feed. I tried my old one recently and had to change frequencies four times in a 2.5 hour drive. And changing channels isn't something the driver should be doing while the vehicle is moving.

Try here for an advertised BT dock: Sirius XM Radio Bluetooth® Vehicle Kits

 

Or get a BT Amazon Echo Auto for a fraction of the price and have Alexa as a bonus.

 

Another thought: I know the Tesla is more technically advanced then my 2017 vehicle, but make sure it can connect to more than one BT device if you go BT docking station for Sat radio. Our two vehicles (2017 and 2018 Fords) can only connect to one at a time. So if we did that, we'd lose our cell hands free features while the SiriusXM BT docking station was connected.

If you can only have one device, the suggestion that gjhine made would work since Echo Auto works through your cell phone. Of course that would be an issue when going through the cell dead zones you mentioned.

 

Note also with Echo Auto you need not use BT at all. It also has Aux port.

Even better you need have only one All Access account. I have one All Access account and Echo Auto in three vehicles thus Sirius and Alexa in all three. I cancelled the Sirius subs for 2 vehicles saving a bunch of money.

 

Just note that the TS said he drives in cell dead zones and is looking for a solution w/o using a cell. Echo Auto requires cell. Additionally, I don't believe the Model 3 has an Aux input.

 

The way I read it the solution he wants still involves Sirius. Dead zones still apply cell or no cell. Additionally, he has BT.

I also take issue with the "UI of the app on my phone" being bad. I set up my favorites in the app and it's one button push to switch channels. Even easier than scrolling on my BMWs and Porsche before I switched to Echo Auto. His post is 2 years old so most likely the app has be redesigned since then.