Spatchock the chicken by cutting out the backbone with kitchen shears and pressing it flat.
Season the chickens with the salt, pepper, paprika, and cayenne (or another rub you like).
Tuck the wings tips of the chicken behind the breasts to give the chicken a “lounging” look.
Prepare the sauce by whisking together all the ingredients. Reserve a portion of it for basting.
Insert RFX MEAT probes into the breasts of each chicken and set the high-temp alarms for 158°F (70°C).
Smoke the chicken, basting with some sauce every 20 minutes.
When the alarms on the app sound, verify the temperature with Sizzle, checking that the legs are over 175°F (79°C) and that the breast has really reached 158°F throughout. Let the chicken rest for about 10 minutes.
Dunk the whole chicken in the sauce and serve with your favorite BBQ sides!