I have an OB/OB package and use this adapter-
Works great for wireless CarPlay with maps, music, & wheel controls. Only thing it doesn’t work with is Siri which is frustrating but better than not having wireless capability at all. From what I saw there isn’t an adapter that works with Siri. I’ve had it for a few months now and it connects automatically without issue and has only disconnected when I accidentally push the voice button to use Siri on the wheel. Overall I’d recommend it if that’s the only thing holding you back from a 2021 model.
Also bummed about not having Sync 4 but love everything else about the OB, wasn’t worth waiting and I couldn’t pass up the opportunity to buy the model I wanted when the dealer had it. Good luck & hope this helps!
I just bought a 2021 RAV4 and it only functions with wired CarPlay. I got this wireless CarPlay adapter from Amazon and it works pretty well. https://www.amazon.com/gp/product/B08FG2MT2D/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1 For this model, your car needs to have factory installed CarPlay. It retains the original car’s wired carplay function, changes the connection method, turns the wired connection into a wireless connection. I think it should work on any kind of car as long as it has the original factory installed CarPlay. By the way, Amazon has very good return policy, you can still return it if it doesn’t fit your vehicle.
2021 outer banks sport & have this adapter. It works well but you can’t use Siri controls with it.
Wireless CarPlay Adapter... https://www.amazon.com/dp/B08FG2MT2D?ref=ppx_pop_mob_ap_share
This is the one I got. It had been recommended here multiple times. Wireless CarPlay Adapter... https://www.amazon.com/dp/B08FG2MT2D?ref=ppx_pop_mob_ap_share